NAHMIAS, Justice.

In 1997, a jury convicted David Aaron Perkins of the murder of Herbert Ryals III, and of related offenses, and it sentenced Perkins to death for the murder. This Court affirmed unanimously on direct appeal, for which Perkins had the same counsel. See Perkins v. State, 269 Ga. 791, 505 S.E.2d 16 (1998). With new counsel, Perkins filed a petition for a writ of habeas corpus on September 27, 1999, which was denied more than nine years later, on October 10, 2008. This Court granted Perkins's application for a certificate of probable cause to appeal and requested that the parties address the following four issues: (1) whether the habeas court erred by denying Perkins's claim that his trial counsel rendered ineffective assistance during the sentencing phase; (2) whether the habeas court erred regarding Perkins's claim that he was mentally incompetent during his trial; (3) whether the habeas court erred regarding Perkins's claim regarding three jury notes that were allegedly received by the trial court during Perkins's trial; and (4) what action this Court should take in light of the allegation by three witnesses in the habeas court that they were misled when asked to sign certain affidavits. In addition to these issues, Perkins has raised several others. For the reasons set forth below, we reverse the habeas court's order insofar as it denied Perkins's claim that he was entitled to a new sentencing trial, we affirm regarding the habeas court's denial of Perkins's claim that he was mentally incompetent at the time of trial, and we remand with direction regarding several remaining issues.1

I. Factual Background

In Perkins's direct appeal, we held that the evidence at trial was sufficient to support his convictions for malice murder and possession of a knife during the commission of a felony, and we affirmed his sentence of death based on the aggravating circumstances that the murder was committed while Perkins was engaged in the commission of an aggravated battery and was outrageously and wantonly vile, horrible, and inhuman in that it involved depravity of mind and an aggravated battery to the victim. See Perkins, 269 Ga. at 792, 792 n. 1, 505 S.E.2d 16. In brief summary, the evidence at trial showed that, on the morning of August 13, 1995, Perkins was entertaining a neighbor, Herbert Ryals, III, who shared an interest in guitar playing. Both men were drinking. Perkins beat Ryals with his guitar, stabbed and cut him 11 times, and hit him in the head with a liquor bottle. The evidence showed that there was an extended struggle throughout the apartment and that Ryals eventually died of blood loss in Perkins's bathroom. Perkins testified at trial that he began stabbing Ryals in self-defense after Ryals hit him from behind unexpectedly and came toward him with "some sharp object." Perkins testified that he then went to the bathroom and "checked my head" and that he resumed his attack on Ryals with the liquor bottle only after Ryals once again began attacking him. However, the evidence indicated that Perkins had no injuries shortly after the murder, and witnesses testified that Perkins had made a comment on the night before the murder suggesting that something untoward might happen later that night because there was a full moon.

II. Ineffective Assistance of Counsel During the Sentencing Phase

Perkins argues that his trial counsel rendered ineffective assistance in that they were insufficiently prepared for the sentencing phase.2 To prevail on this claim, Perkins must show that his trial counsel rendered constitutionally deficient performance and that actual prejudice of constitutional proportions resulted. See Strickland v. Washington, 466 U.S. 668, 687, 104 S.Ct. 2052, 80 L.Ed.2d 674 (1984); Smith v. Francis, 253 Ga. 782, 783-784, 325 S.E.2d 362 (1985). Counsel's performance is measured according to the professional norms prevailing at the time of trial. See Hall v. McPherson, 284 Ga. 219, 221, 663 S.E.2d 659 (2008). Counsel's performance is considered in light of the circumstances as they existed at the time of trial, and the "`distorting effects of hindsight'" are disregarded. Wiggins v. Smith, 539 U.S. 510, 523, 123 S.Ct. 2527, 156 L.Ed.2d 471 (2003) (quoting Strickland, 466 U.S. at 689, 104 S.Ct. 2052). To show sufficient prejudice to prevail on his ineffective assistance claim, Perkins must show that "there is a reasonable probability (i.e., a probability sufficient to undermine confidence in the outcome) that, but for counsel's unprofessional errors, the result of the proceeding would have been different." Smith, 253 Ga. at 783, 325 S.E.2d 362 (citation omitted). This Court accepts the habeas court's findings of fact unless they are clearly erroneous, but we apply the law to those facts de novo. See Head v. Carr, 273 Ga. 613, 616, 544 S.E.2d 409 (2001). In weighing prejudice, we consider the collective prejudice from all of trial counsel's deficiencies. See Schofield v. Holsey, 281 Ga. 809, 811-812 n. 1, 642 S.E.2d 56 (2007).

A. Deficient Performance

There is some tension, if not outright contradiction, between lead counsel's and co-counsel's accounts of who was responsible for preparing for the sentencing phase. Lead counsel testified that the responsibility was co-counsel's, while co-counsel testified that he prepared for the sentencing phase only in consultation with, and under the leadership of, lead counsel. This breakdown of communication and organization seems to explain, at least in part, why Perkins's case was not investigated more thoroughly than it was. See Terry v. Jenkins, 280 Ga. 341, 344, 627 S.E.2d 7 (2006) (affirming the habeas court's vacating of a death sentence where lead counsel and co-counsel miscommunicated regarding who would be responsible for preparing evidence).

The first aspect of trial counsel's performance that was deficient was their failure to fully investigate whether Perkins had suffered one or more brain injuries prior to his crimes. Perkins's original co-counsel, who was later replaced at his insistence, discovered that Perkins once was attacked by several men with a steel rake, that prongs of the rake were embedded in his skull and had to be removed surgically, and that Perkins ever since has had an identifiable hole in his skull. That lawyer testified in the habeas court that she became concerned that Perkins might have suffered an injury to the frontal lobe of his brain and that she therefore attended a seminar on frontal lobe injuries presented by an Emory University professor. The evidence in the habeas record shows that she sent two requests for medical records regarding treatment Perkins received as a result of the rake incident. However, one of the requests bears what was, or at least now is, an incorrect mailing address, and the second request listed an incorrect birth year for Perkins. She testified that she nevertheless received a response from the hospital, which included Perkins's name and a medical records number but which indicated that the records were too old to still be available; however, habeas counsel have now succeeded in obtaining those records from the hospital. She also testified that Perkins stated to her that he was "not going to be branded as mentally incompetent" and that lead counsel was not interested in pursuing her theory of possible brain damage.

Perkins eventually demanded that she be removed as co-counsel, primarily because she had contacted a woman who had been visiting him at the jail and because she had contacted his jail mates seeking information about his mental condition. As discussed below, lead counsel was unable to persuade Perkins to submit to an examination by a psychiatrist or psychologist. In light of all of the evidence available, it seems that the only manner in which trial counsel clearly rendered deficient performance regarding the rake incident was in not interviewing family members and friends regarding any possible changes in Perkins's behavior following the incident.

Trial counsel also performed deficiently by unduly limiting their interviews of Perkins's family and friends to an unreasonably narrow range of persons. The record indicates that counsel did meet repeatedly with Perkins and his mother and that counsel contacted Perkins's estranged second wife. Counsel also apparently contacted Perkins's aunt but did not ask her about his background. Although the habeas court further found that trial counsel had attempted to contact his father, his sister, and a third person regarding whom the record appears silent, it is clear that these attempts were limited to taking his mother's word at face value that the witnesses were "unavailable" and making some telephone calls that were never returned. Furthermore, there is nothing in the trial or habeas records to suggest that trial counsel attempted to contact any of the numerous other family members and friends who testified in the habeas court.

The habeas court found that trial counsel's failure to take further steps to interview Perkins's other relatives was due to his own resistance to having counsel investigate his background more fully. In his testimony in the habeas hearing, co-counsel gave this account of Perkins's reaction to inquiries about possible mitigating evidence:

In his deposition, co-counsel gave the following, similar testimony about contacting Perkins's family members:

Co-counsel testified that he now, in retrospect, believes that he erred too far on the side of establishing a good rapport with Perkins rather than pressing Perkins and other persons for additional mitigating evidence.3 The ABA Guidelines at the time of Perkins's trial, which this Court has acknowledged may serve as a guide to reasonable defense preparations in capital cases, indicate that trial counsel should conduct an investigation seeking possible evidence for the sentencing phase "regardless of any initial assertion by the client that mitigation is not to be offered." ABA Guidelines for the Appointment and Performance of Counsel in Death Penalty Cases (1989), 10.4.1(C). See also McPherson, 284 Ga. at 221, 663 S.E.2d 659 (noting the relevance of published professional guidelines in assessing what might have been reasonable in a particular case).

The ABA Guidelines, at first blush, might appear to be in tension with this Court's previous decisions indicating that the client is ultimately the master of his own defense, including whether or not to present any mitigating evidence. See Colwell v. State, 273 Ga. 634, 638, 544 S.E.2d 120 (2001) (holding that the trial court had "properly respected Colwell's right to make the `ultimate decision about' what sort of case to present" (citation omitted)); Morrison v. State, 258 Ga. 683, 685-686, 373 S.E.2d 506 (1988) (noting that, at Morrison's request, no mitigating evidence was presented). However, we provided a fuller explanation of the correct analysis in discussing the sentencing phase of another capital case:

Mize v. State, 269 Ga. 646, 656, 501 S.E.2d 219 (1998). In other words, reasonable attorney performance includes investigating mitigating evidence to the extent feasible given the defendant's willingness to cooperate and then, if the defendant insists, following his instructions regarding the ultimate defense to pursue. Perkins's trial counsel plainly failed to take such an approach in investigating his background.

The Warden correctly argues that trial counsel were limited in their ability to investigate Perkins's mental health issues because he steadfastly refused to participate in an evaluation by either the court-appointed expert or by the expert hired privately by his trial counsel with funds provided by the trial court. See Jenkins v. State, 265 Ga. 539, 540-541, 458 S.E.2d 477 (1995) (holding that expert mental health testimony derived from an evaluation of a defendant is admissible only if the defendant cooperates in an evaluation by an expert selected by the State). Nonetheless, we conclude that trial counsel performed deficiently by failing to sufficiently develop mitigating evidence from nonexperts in light of the following: (1) the fact that trial counsel had a duty to make reasonable efforts to investigate Perkins's background despite Perkins's resistance to being "labeled [as] crazy" and his resistance to having his background probed deeply; (2) the fact that presenting at least some of Perkins's background was obviously possible, despite his reservations, because trial counsel did in fact present some testimony about his background at trial through his mother; (3) the fact that trial counsel took only limited steps to obtain information from Perkins's family and friends other than his mother and estranged wife; (4) the fact, discussed below, that trial counsel had reason to believe from the evidence that they already possessed that Perkins had a troubled background and a possible brain injury; and (5) the fact that habeas counsel, using methods that were available to trial counsel despite Perkins's lack of cooperation, were ultimately able to develop compelling mitigating evidence.

B. Prejudice

Having concluded that trial counsel performed deficiently in obtaining non-expert mitigating evidence for the sentencing phase, we turn to whether that deficiency had a reasonable probability of changing the outcome of Perkins's trial.

The first category of important additional evidence from non-experts concerns Perkins's traumatic childhood. Perkins's mother testified in the sentencing phase. She said that Perkins's father, her ex-husband, slapped and abused her; that, from the time Perkins was three years old, his father would beat him with his fists, hands, and a belt; that Perkins "was very much abused" and that she would step in to take beatings instead of letting him take them; that Perkins's father forbade him from participating in sports after he obtained only "medium" grades in school; that Perkins's father gave her only ten dollars per week for groceries; that Perkins's father would often stay out for half the night drinking; that Perkins's father was eventually forced out of the family home after she was beaten and left covered with bruises on one particular occasion; and that Perkins wanted to move in with his father at the age of 13 and, upon his arrival at his father's house, was given "a bottle of Jack Daniels and all the pot he could smoke."

Perkins's new evidence of his abusive background is admittedly somewhat cumulative, but overall it is far more compelling: (1) his aunt testified by affidavit that, on one occasion when Perkins was four years old, his father beat him at a picnic with his fists until he collapsed and that, on another occasion, his father beat him with a belt on a camping trip for no reason; (2) his first wife testified by affidavit that his father hit him as an adult "a number of times," that he "would have what [she] call[ed] flashbacks where he would see himself being beaten by his father," and that one night, while he and his father were drinking, his father urinated on him; (3) his father admitted in an affidavit that he "went overboard" hitting Perkins at a picnic when he was three years old, gave him "a number of whippings . . . often times because he just wouldn't listen," and gave him liquor and marijuana from the age of 15 or 16; (4) his mother gave affidavit testimony describing Perkins's somewhat odd religious beliefs; (5) another cousin gave affidavit testimony indicating that Perkins's father would "whip" him with an open hand or a belt for things like breaking a window or tracking in dirt and that he began using drugs at 12 or 13 years old when his father gave them to him; (6) his younger sister gave affidavit testimony indicating that their father hit and bruised their mother and put his hand around her throat and that Perkins once attempted to slit his wrists with a razor blade; (7) his former stepmother gave affidavit testimony indicating that his father gave him drugs and alcohol, was a drunk, and beat him with his fists beginning at age 12 or 13; (8) a friend of his wife gave habeas testimony indicating that she had seen cuts on his wrists; (9) his mother and a cousin gave affidavit testimony indicating that a young male neighbor had raped Perkins when he was eight years old; (10) his wife gave affidavit testimony indicating that his father beat him and his mother when he was a child; and (11) his daughter gave affidavit testimony indicating that he "said sometimes he would re-live the beatings in his mind and that it would freak him out."4

Even more powerful than the evidence of Perkins's traumatic personal background is the additional evidence habeas counsel were able to obtain concerning his change in behavior and apparent mental distress following two head injuries. As discussed above, trial counsel learned pre-trial that Perkins had been attacked with a steel rake when he was approximately 20 years old, that several prongs of the rake had become stuck in his skull and had to be surgically removed, and that he was left with a permanent, identifiable hole in his skull. Pretermitting whether trial counsel performed deficiently in seeking Perkins's medical records regarding this injury, which indicate that two prongs of the rake actually penetrated his brain, we note that testimony from lay witnesses was available that would have shown that Perkins, while somewhat troubled before being injured by the rake, suffered from significant personality and cognitive changes afterward. Furthermore, upon investigating possible consequences from the rake incident, trial counsel would likely have discovered the evidence Perkins presented in his habeas proceedings that, at approximately 18 years old, Perkins was involved in an automobile accident that left him in a coma for five days after the accident and that, as with the rake incident, he suffered from significant personality and cognitive changes afterward.

The relevant new testimony about the effects of these two head injuries was as follows: (1) Perkins's mother gave affidavit testimony indicating that, after the automobile accident, he suffered personality changes, lost approximately six months of memory, slurred his speech constantly, had blurred vision and dizziness, had constant ringing in his ears and blackouts, and had problems with short-term memory and that, after the rake incident, his headaches intensified, he began to drink heavily to numb his pain, he would stare suddenly for several minutes, and he had scars on his wrists; (2) his aunt gave affidavit testimony indicating that, after the automobile accident, Perkins "became more sullen and more prone to act out" and that he "seemed to become more easily agitated, especially when he was drinking"; (3) his ex-wife gave affidavit testimony indicating that, after the automobile accident, Perkins had "blackouts" even when he was not drinking, he once stuck a knife in a couch and shortly afterward seemed not to know who had done it, and he threatened to slit his wrists and that, after the rake incident, he "was really messed up," "would constantly complain of headaches and nausea," and "would drink and smoke pot to try to kill the pain"; (4) his father gave affidavit testimony indicating that Perkins got into a fight suddenly and for no apparent reason and further indicating that to some extent even since childhood he had seemed to suffer from blackouts and sudden and unexplained staring into space; (5) his cousin gave affidavit testimony indicating that, after the automobile accident, Perkins had to be restrained on his hospital bed, "would look at you but not see you," began drinking more heavily, complained of constant headaches, and got into more trouble than before; (6) two other cousins gave affidavit testimony indicating that, after the automobile accident, Perkins had to be restrained on his hospital bed and that his behavior and memory deteriorated after the automobile accident and the rake incident; (7) his younger sister gave affidavit testimony indicating that, after the automobile accident and the rake incident, Perkins "seemed different," had memory problems, would "zone out" more than he had before the accidents, and attempted to slit his wrists; (8) his wife gave affidavit testimony indicating that Perkins had constant headaches from the time she met him, which was after the two head injuries, that he drank to relieve his headaches, that he was often depressed, that he had scars on his wrists, and that he would "zone out" and have memory problems even when he was not drinking or taking drugs; (9) his daughter gave affidavit testimony indicating that Perkins "would break out in a cold sweat and get this odd look in his eyes" as if he were "in a trance"; (10) a friend of his wife gave affidavit testimony indicating that she had seen cuts on Perkins's wrists; (11) one of his friends gave affidavit testimony indicating that, on one occasion shortly after the rake incident, Perkins "went schizo," "started freaking out," threw a five-gallon paint can, "jumped on" the friend, and "was just going nuts" and that, in general after the rake incident, his "normal self wasn't that normal"; and (12) another friend and several jail mates gave further testimony about how Perkins would stare and "zone out."

We note again that, although Perkins resisted investigation of this sort of evidence and refused expert mental health evaluations, he did not preclude his trial counsel from presenting a mitigation defense that included details about his personal history. Compare Mize, 269 Ga. at 656, 501 S.E.2d 219. After our review of the non-expert evidence that Perkins's habeas counsel discovered and presented in the habeas court, which would have been available to trial counsel upon a reasonable investigation, we conclude that there is a reasonable probability that the jury would have reached a different outcome in the sentencing phase of Perkins's trial if that additional evidence had been presented at trial. Accordingly, we reverse the habeas court's judgment on this issue and direct that Perkins's current death sentence be vacated.

III. Competence to Stand Trial

A. Trial Proceedings on Competence

Perkins claimed in the habeas court that he had been mentally incompetent at the time of his trial. In the trial court, Perkins initially filed a special plea of incompetence. See OCGA § 17-7-130(b). The trial court twice authorized an examination of Perkins by a psychiatrist, but Perkins refused to cooperate both times. Perkins explained to the trial court that one reason for his refusal to cooperate was that one of the psychiatrists wanted to talk to "a certain person, such as a wife," who might lie about him. Trial counsel eventually withdrew Perkins's plea of incompetence.

At the hearing in which Perkins formally withdrew his plea of incompetence, trial counsel stated as follows:

The trial court responded as follows:

The trial court continued as follows:

Perkins and his counsel never raised the issue again in the trial court.

B. Procedural Default

1. Georgia Precedent

The habeas court correctly concluded that Perkins's claim that he was tried while incompetent is, at least as an initial matter, barred by procedural default because the claim was not pursued to a conclusion at trial and was not raised on direct appeal. See Head v. Thomason, 276 Ga. 434, 441, 578 S.E.2d 426 (2003) ("The habeas court correctly found Thomason's claim he was tried while incompetent was barred by procedural default and no cause or prejudice had been shown to overcome that bar."). See also OCGA § 9-14-48(d) (establishing statutory procedural default doctrine for habeas proceedings).5 Perkins's attempt to distinguish his case from Thomason, based on the fact that Thomason actually obtained a verdict on his competence in the trial court while Perkins did not, is unpersuasive. Thomason raised the issue of his competence pre-trial, obtained an unfavorable verdict on the issue, and then chose to appeal based solely on the fact that a "not guilty" plea had been entered on his behalf before his competency trial rather than also appealing the soundness of the subsequent competency trial verdict. See Thomason, 276 Ga. at 441, 578 S.E.2d 426; Thomason v. State, 268 Ga. 298, 308, 486 S.E.2d 861 (1997). An issue becomes subject to procedural default when the defendant fails to raise the claim either at trial or on direct appeal. See OCGA § 9-14-48(d) ("The court shall review the trial record and transcript of proceedings and consider whether the petitioner made timely motion or objection or otherwise complied with Georgia procedural rules at trial and on appeal.. . ." (emphasis added)); Head v. Ferrell, 274 Ga. 399, 401, 554 S.E.2d 155 (2001) ("Claims, other than those regarding sentencing phase jury instructions in death penalty trials, that are raised for the first time in habeas corpus proceedings that could have been raised at trial or on direct appeal are barred by procedural default unless the petitioner can meet the `cause and prejudice' test." (emphasis added)). For purposes of determining whether procedural default doctrine will apply, we do not see a meaningful distinction between the failure to exercise a defendant's right to have his competence determined in the trial court and the failure to exercise a defendant's additional right to have a competency determination evaluated on appeal.

2. Related Federal Case Law

We also reject Perkins's argument that, in light of case law from some federal courts, we should overrule Thomason and declare substantive claims of incompetence to stand trial categorically exempt from procedural default. These courts, most notably the Eleventh Circuit, base their position on the United States Supreme Court's statement in Pate v. Robinson that "`it is contradictory to argue that a defendant may be incompetent, and yet knowingly or intelligently "waive" his right to have the court determine his capacity to stand trial.'" Adams v. Wainwright, 764 F.2d 1356, 1359 (11th Cir.1985) (quoting Pate v. Robinson, 383 U.S. 375, 384, 86 S.Ct. 836, 15 L.Ed.2d 815 (1966)). The Eleventh Circuit bases its position on binding precedent from the old Fifth Circuit. See id. (citing cases dating back to Bruce v. Estelle, 483 F.2d 1031, 1037 (5th Cir.1973)).6

At the time Bruce v. Estelle was decided, however, "procedural default" in federal habeas corpus was treated as the equivalent of deliberate "waiver." See Fay v. Noia, 372 U.S. 391, 438-439, 83 S.Ct. 822, 9 L.Ed.2d 837 (1963) (holding that "the federal habeas judge may in his discretion deny relief to an applicant who has deliberately bypassed the orderly procedure of the state courts and in so doing has forfeited his state court remedies" and emphasizing that "[t]he classic definition of waiver . . .—`an intentional relinquishment or abandonment of a known right or privilege'—furnishes the controlling standard" (citation omitted)). However, the United States Supreme Court soon limited and ultimately rejected the "deliberate bypass" approach to procedural default, and for almost two decades now federal habeas courts have been required to apply procedural default (absent a showing of cause and prejudice or a miscarriage of justice) based on independent and adequate state procedural rules, including rules by which claims are deemed waived by inaction rather than by proof of the intentional relinquishment of a known right. See Wainwright v. Sykes, 433 U.S. 72, 87-88, 97 S.Ct. 2497, 53 L.Ed.2d 594 (1977) (holding that a state court's application of its contemporaneous objection rule procedurally barred federal habeas relief, limiting Fay v. Noia's "sweeping" dicta); Coleman v. Thompson, 501 U.S. 722, 750, 111 S.Ct. 2546, 115 L.Ed.2d 640 (1991) (holding that a state court's decision implicitly based on the failure to file a timely appeal procedurally barred federal habeas relief, explicitly rejecting Fay v. Noia).

Accordingly, several federal circuits have rejected the Eleventh Circuit's "expansive reading of Pate," finding that approach "untenable when applied to a case in which the State has raised the defense of procedural default, rather than waiver," with respect to a substantive claim of incompetence to stand trial. Martinez-Villareal v. Lewis, 80 F.3d 1301, 1307 (9th Cir.1996) (citing cases). We believe the Ninth Circuit's view properly recognizes that "[t]he analytical basis of a defense of waiver differs markedly from that of a defense of procedural default." Id. See also Noble v. Barnett, 24 F.3d 582, 588 (4th Cir.1994) (discussing the same analytical difference between waiver doctrine and successive petition (abuse of the writ) doctrine). This view is also consistent with our holding in Thomason, a case decided long after Pate v. Robinson and Adams v. Wainwright, which applied procedural default to bar a claim of incompetency to stand trial, see 276 Ga. at 441, 578 S.E.2d 426, in accordance with Georgia's broad rule that alleged errors must be raised in the trial court and on direct appeal. See OCGA § 9-14-48(d). We therefore hold that, notwithstanding the contrary position of some federal courts, substantive claims of incompetence to stand trial will continue to be subject to procedural default in Georgia.

C. Cause and Prejudice

A claim that is subject to procedural default may nevertheless be considered in habeas corpus proceedings if the petitioner can satisfy the cause and prejudice test. See id.; Ferrell, 274 Ga. at 401, 554 S.E.2d 155. A common method of satisfying the cause and prejudice test is to show that trial and direct appeal counsel rendered ineffective assistance, see Turpin v. Todd, 268 Ga. 820, 824-826, 493 S.E.2d 900 (1997), and ineffective assistance is the only argument that Perkins offers to excuse the procedural default of his claim that he was incompetent at trial. Similar to other claims of ineffective assistance, a habeas petitioner seeking to overcome a procedural default must show professionally deficient performance by trial or direct appeal counsel and that the deficiencies had a reasonable probability of changing the outcome of the trial. See Strickland, 466 U.S. at 687, 104 S.Ct. 2052; Hall v. Lewis, 286 Ga. 767, 769, 692 S.E.2d 580 (2010). Because a showing of ineffective assistance of counsel regarding a procedurally defaulted issue requires a showing of prejudice that is comparable to the prejudice that must be shown under the cause and prejudice test, a petitioner who has shown the former will be deemed to have automatically shown the latter. See Todd, 268 Ga. at 828-829, 493 S.E.2d 900.

We hold, however, that Perkins has failed to prove that his trial counsel rendered ineffective assistance regarding his competence to stand trial. Our discussion regarding Perkins's claim that his trial counsel rendered ineffective assistance in the sentencing phase obviously implicates a number of mental health issues, including childhood abuse, substance abuse from a young age, and repeated head injuries that, according to lay witnesses, affected Perkins's personality, demeanor, memory, and self-control. However, the issue of Perkins's competence to stand trial was much narrower than the extremely broad issue of mitigating evidence in the sentencing phase. As we explained in a case where the defendant actively sought the death penalty, a defendant may suffer even extreme mental health problems and still be competent to stand trial because he can "underst[and] the nature and object of his proceedings and . . . possess[es] the intellectual and communication skills necessary to participate in his" defense. Colwell, 273 Ga. at 636, 544 S.E.2d 120. See also Stripling v. State, 261 Ga. 1, 2, 401 S.E.2d 500 (1991) (setting forth the same competency test).

Trial counsel withdrew Perkins's plea of incompetence only after satisfying themselves that they were able to communicate effectively with him. Perkins's previous co-counsel had reported that Perkins claimed to have received communications from God in the form of androgynous faces visible in the clouds, but despite the odd and possibly delusional nature of this claim, there is no evidence that trial counsel found that it prevented Perkins from comprehending the nature of the proceedings or assisting in his defense. Likewise, Perkins's unwillingness to cooperate with a mental health evaluation and his demonstrative behavior at trial, which trial counsel described (after trial in his habeas testimony) as "bizarre," did not show that he was unable to understand the proceedings or assist in his defense. Moreover, trial counsel attempted to have Perkins evaluated by several psychiatrists, but he refused, and they also unsuccessfully moved the trial court to have Perkins moved to a psychiatric hospital for an extended period of observation. Thus, the absence of an expert evaluation of Perkins was not attributable to any deficiencies of trial counsel. Finally, the trial court had an extensive opportunity to observe Perkins in pre-trial and trial proceedings, and to interact directly with him, and the court did not see sufficient indications of incompetence to pursue further evaluation.7

We conclude that the information that trial counsel then had available to them, including the information that we have found that trial counsel unreasonably failed to obtain, would not have led constitutionally effective counsel to pursue a claim of incompetence to stand trial and would not be reasonably probable to have resulted in a finding that Perkins was incompetent had such a plea been pursued. Accordingly, the habeas court correctly concluded that ineffective assistance of trial counsel could not be used to excuse the procedural default of Perkins's claim that he was mentally incompetent during his trial.

D. Miscarriage of Justice

In addition to the cause and prejudice exception, OCGA § 9-14-48(d) provides an exception to the procedural default rule where necessary "to avoid a miscarriage of justice." Like its non-statutory federal counterpart, our statutory miscarriage of justice exception has always been interpreted as a very narrow exception tied to evidence of actual innocence, thereby advancing the fundamental purpose of the habeas writ, "which is to free the innocent wrongfully deprived of their liberty." Valenzuela v. Newsome, 253 Ga. 793, 796, 325 S.E.2d 370 (1985). In Valenzuela, we noted the federal analogue and explained that

Id. (emphasis added). See also Sawyer v. Whitley, 505 U.S. 333, 339, 347, 112 S.Ct. 2514, 120 L.Ed.2d 269 (1992) (equating the "miscarriage of justice" exception with "actual" or "factual" innocence and reiterating its "narrow scope," while holding that it applies to eligibility for the death penalty as well as for conviction of a crime).

Perkins has not argued that the miscarriage of justice exception applies to his claim that he was incompetent to stand trial. Nevertheless, the dissent asserts that applying the exception to Perkins' claim is simply an application of our decision in Turpin v. Hill, 269 Ga. 302, 498 S.E.2d 52 (1998), where we held that the exception applied to a claim of mental retardation that would preclude a death sentence. See id. at 303, 498 S.E.2d 52; Dissenting Op. at 353. There are two major problems with the dissent's approach. First, it requires overruling Thomason, a unanimous opinion decided five years after Hill, which did not apply the miscarriage of justice exception to the same type of incompetency claim, instead finding the claim procedurally defaulted. See Thomason, 276 Ga. at 441, 578 S.E.2d 426. Moreover, the Thomason Court was clearly aware of the exception, which is discussed in the sole case cited in support of the procedural default holding. See id. (citing Ferrell, 274 Ga. at 401-402, 554 S.E.2d 155, which in turn cites and discusses Valenzuela, noting that "an extremely high standard applies in such [miscarriage of justice] cases"). The dissent simply ignores this stare decisis issue.

Second, the claim in this case is entirely different from the claim at issue in Hill. Mental retardation fits the traditional conception of a "miscarriage of justice," because a mentally retarded defendant is constitutionally ineligible to be executed and therefore actually innocent of culpability for a death sentence. See Fleming v. Zant, 259 Ga. 687, 690, 386 S.E.2d 339 (1989) (applying Georgia Constitution). Accord Atkins v. Virginia, 536 U.S. 304, 321, 122 S.Ct. 2242, 153 L.Ed.2d 335 (2002) (applying the United States Constitution). By contrast, a mentally retarded defendant may be convicted of a crime, and thus Hill noted that the procedural default rule would still apply to claims of mental retardation used to challenge guilt-innocence phase issues. See 269 Ga. at 303 n. 2, 498 S.E.2d 52.

The rationale of Hill might extend to a claim that Perkins was mentally incompetent (i.e., insane) at the time of his crimes, because that would make him actually innocent of the offenses. See OCGA § 16-3-2 ("A person shall not be found guilty of a crime if, at the time of the act, omission, or negligence constituting the crime, the person did not have mental capacity to distinguish between right and wrong in relation to such act, omission, or negligence."). The rationale might also extend to a claim that Perkins is insane now, because that would make him constitutionally ineligible to be executed.8 But that is not the claim that Perkins seeks to raise; instead, he seeks review of his claim he was incompetent at the time of trial. That issue does not relate to his culpability or "actual innocence"—his factual innocence of or ineligibility to be punished for the crimes he was accused of committing. It is instead a trial right—a due-process based protection designed to ensure that he received a fair trial. See Drope v. Missouri, 420 U.S. 162, 171-172, 95 S.Ct. 896, 43 L.Ed.2d 103 (1975).

Indeed, even if Perkins was incompetent at the time of his trial and is incompetent today, if he could be rendered competent in the future (even by forcing him to take medication), he could be lawfully tried, convicted, and sentenced to death once again. See OCGA § 17-7-130(h) (allowing the State to file a motion for rehearing at any time after a defendant has been found incompetent to stand trial, upon a showing that his mental condition has changed); Riggins v. Nevada, 504 U.S. 127, 135, 112 S.Ct. 1810, 118 L.Ed.2d 479 (1992) (holding that a state may under some circumstances treat a defendant against his will to render him competent to stand trial). In short, someone who is mentally competent (sane) when he commits a crime is culpable for that offense, even if his later incompetency prevents him (perhaps only temporarily) from being tried for the offense.

The dissent also asserts that Hill was based on the rationale that mental retardation was "such a critical constitutional matter that allowing a waiver thereof would be a miscarriage of justice," and says that "the right not to be tried while incompetent" is similarly critical. See Dissenting Op. at 353. But Hill did not say that its holding was based on the importance of the constitutional matter at issue there, and we are aware of no case in which this Court (or any other appellate court) has extended the "miscarriage of justice" exception beyond claims that a defendant is actually innocent to claims involving trial rights, no matter how important those rights may be. See Valenzuela, 253 Ga. at 796, 325 S.E.2d 370 (explaining that "the term [miscarriage of justice] is by no means to be deemed synonymous with procedural irregularity, or even with reversible error"). As discussed above, the federal courts have vigorously debated whether procedural default should apply to substantive claims of incompetency to stand trial, but none of those courts has suggested that the miscarriage of justice exception would apply in any event. Moreover, habeas petitioners in Georgia courts routinely raise trial rights of the highest constitutional importance, including the right to be present during trial,9 which are routinely denied as procedurally defaulted. See, e.g., Ferrell, 274 Ga. at 402, 554 S.E.2d 155 (holding procedurally barred, and not applying the miscarriage of justice exception to, claims including closing the courtroom during trial, the defendant's constructive absence from court during trial, erroneous jury instructions on reasonable doubt, involuntariness of guilty pleas, and racial discrimination in seeking the death penalty).

Even if the dissent's theory could be restricted to incompetency to stand trial claims, which we doubt, it would not be limited to the comparatively few defendants on death row like the mental retardation claim at issue in Hill. Instead, the dissent would now allow any convicted defendant to raise an incompetency to stand trial claim for the first time in a habeas petition, which the habeas court would have to resolve on the merits, or even perhaps in a successive habeas petition, if the claim was not previously adjudicated on the merits. That is hardly the sort of "rare occasion" that the miscarriage of justice exception was intended to cover. Valenzuela, 253 Ga. at 796, 325 S.E.2d 370. Therefore, we decline the dissent's invitation to overrule Thomason and to venture down the path of excusing procedural default whenever the court in a habeas corpus proceeding believes a "critical" constitutional trial right is at issue.

IV. Notes Received by the Trial Court from the Jury

Perkins's habeas counsel discovered the existence of three notes, written by the jury to the trial judge, that had not been included in the record on appeal. The notes, not necessarily in chronological order, read as follows:

Perkins claimed in the habeas court that he was entitled to a new trial because the trial court had not informed him about these notes or any responses made by the trial court to them. The habeas court ordered that a hearing be held by the trial court to reconstruct the factual details surrounding the notes.10

The habeas court correctly concluded that, as an initial matter, Perkins's claim regarding the notes was procedurally defaulted because that claim was not raised in the trial court or on direct appeal. The critical inquiry here, however, is whether the habeas court correctly found that Perkins had failed to show cause and prejudice sufficient to overcome the procedural default as to any of the notes. See Ferrell, 274 Ga. at 401-402, 554 S.E.2d 155.

The transcript of the special hearing held in the trial court during the habeas proceedings clearly supports the implicit finding of fact in the habeas court's order that neither Perkins, his counsel, nor the prosecutor were informed about these notes by the trial court. The trial court had a duty to inform the parties of any questions from the jury that were material to the jury's deliberations so that the trial court's responses, or lack thereof, could be objected to. See Morris v. State, 257 Ga. 781, 784, 364 S.E.2d 571 (1988) ("[A]ny answers to such questions [from the jury] must be given in open court with the accused and his counsel present."). Cause sufficient to overcome procedural default exists where "interference by governmental officials" has prevented a defendant from raising a claim at trial and on direct appeal, Todd, 268 Ga. at 825, 493 S.E.2d 900, and we hold that the trial court's failure to disclose any of the jury communications that were material to its deliberations constitutes such interference by a governmental official.

We also hold that the prejudice required to overcome procedural default in the habeas corpus context is not the strong (albeit rebuttable) presumption of prejudice that might apply if this claim regarding jury notes were being considered on direct appeal. See Burtts v. State, 269 Ga. 402, 403-404, 499 S.E.2d 326 (1998) (noting, on direct appeal, that "unless the character of the communication clearly shows that it could not have been prejudicial to the accused, the presumption of law would be that it was prejudicial, and the accused would be entitled to another trial." (punctuation omitted)). The general rule is that presumptions of harm that would have applied on direct appeal do not apply on habeas corpus to procedurally defaulted claims. See Todd, 268 Ga. at 828, 493 S.E.2d 900. Although Perkins argues that this case presents the type of "compelling circumstances" that this Court previously indicated might warrant an exception to this general rule, id., we now hold that such an extraordinary exception should apply only where dictated by constitutional law or where clearly necessary to avoid a miscarriage of justice under OCGA § 9-14-48(d). Because no such extraordinary circumstances exist here, we hold that the prejudice that must be shown to overcome the procedural default of Perkins's claim is actual prejudice.

Having laid out the general background of Perkins's claim regarding the jury notes at issue and the law applicable to this claim, we now address each note separately.

A. Note Regarding Voluntary Manslaughter

The habeas court found that the jury's note regarding the definition of malice murder and voluntary manslaughter was withdrawn by the jury. Consequently, Perkins cannot show prejudice regarding the trial court's failure to inform him of the note, regardless of when it was received, and the habeas court did not err by refusing to grant relief based on this note.

B. Note Regarding Perkins's Testimony

The habeas court found that the trial court responded to the jury's question about whether Perkins "ha[d] the right to speak in his behalf after found [sic] guilty and before sentencing" by writing the following response: "The evidence is closed. You have heard all the remarks from both sides." Although the habeas court did not make an explicit finding on this point, this note and response were obviously written at some time after the jury began deliberating, and the question was clearly material. If the note was received while the jury was deliberating in the sentencing phase of Perkins's trial, the question of prejudice is moot in light of our decision to vacate Perkins's death sentence on other grounds, and therefore we need not address whether the trial court's failure to inform defense counsel about the note may have affected their sentencing phase strategy. But even if the note was received while the jury was deliberating in the guilt/innocence phase, Perkins was not prejudiced by the trial court's response, which reflects an appropriate exercise of discretion. See Burtts, 269 Ga. at 403-404, 499 S.E.2d 326 (holding that an unobjectionable ex parte response to a jury's question was not harmful even under the standard applied on direct appeal); State v. Roberts, 247 Ga. 456, 277 S.E.2d 644 (1981) (holding that a trial court has the discretion to grant or deny a motion to reopen the evidence during jury deliberations). Accordingly, there is no need for the issue of this note to be addressed on remand.

C. Note Regarding the Jury's Safety

The note in which the jurors expressed concern for their safety is a different matter. We accept the habeas court's implicit finding that Perkins was not informed about the note and its explicit finding that the trial court did not respond to the note, and the note's subject matter clearly was material to the jury's deliberations if the note was written prior to the conclusion of those deliberations. If the jury sent the note while it was deliberating over Perkins's guilt or his sentence, the trial court's failure to advise the parties of this inquiry and to respond appropriately amounts to actual prejudice. This is because the note, if written during deliberations, would clearly indicate that the jurors were being actively distracted from their duties by serious and inappropriate external concerns. However, the habeas court's order makes no finding of fact regarding when the note was written, and we therefore must remand for a finding as to whether the note was written before the conclusion of the jury's deliberations. Because we have already vacated Perkins's death sentence on other grounds, the remaining relevant inquiry is only whether the note was written prior to the conclusion of the jury's deliberations in the guilt/innocence phase.

V. Witnesses Allegedly Misled Into Giving False Testimony

The record contains three affidavits in which witnesses allege that earlier affidavits bearing the witnesses' signatures were obtained through deceit and were false in material part. This situation has arisen with alarming regularity in death penalty habeas corpus cases, and this Court has already twice stated in opinions that it finds the matter "troubling." Whatley, 284 Ga. at 565 n. 28, 668 S.E.2d 651; Holsey, 281 Ga. at 814 n. 2, 642 S.E.2d 56. We have urged the habeas courts that encounter such circumstances "to make a full inquiry, make any appropriate findings of facts, and take appropriate action. . . ." Whatley, 284 Ga. at 565 n. 28, 668 S.E.2d 651. Accordingly, and particularly because we are remanding this case for other reasons, we direct the habeas court on remand to conduct a hearing to determine whether there has been any intentional misconduct on the part of either the witnesses or the persons who obtained their affidavits and, if so, to take any action the court deems appropriate, including contempt sanctions or referral to the appropriate district attorney for possible criminal prosecution.

VI. Remaining Claims

A. Perkins's remaining claims regarding the sentencing phase of his trial and his sentence are moot in light of this Court's decision to vacate his death sentence.

B. Perkins presents no authority for his argument that all of his habeas claims should be considered together with all of the claims he previously raised on direct appeal, and we reject that argument. See Holsey, 281 Ga. at 811-812 n. 1, 642 S.E.2d 56 (noting that this Court does not recognize the cumulative error rule).

C. On direct appeal, this Court rejected Perkins's argument that it was a violation of the Georgia Code and was unconstitutional to admit the hearsay statements of his estranged wife at trial under the necessity exception to the hearsay rule. See Perkins, 269 Ga. at 795-796, 505 S.E.2d 16. Perkins's current argument that the use of the hearsay statements violated the new rule of constitutional law announced in Crawford v. Washington, 541 U.S. 36, 124 S.Ct. 1354, 158 L.Ed.2d 177 (2004), does not warrant relief on habeas corpus, because that new rule is not given retroactive effect to cases no longer in the "pipeline" of trial and direct appeal. See Whorton v. Bockting, 549 U.S. 406, 127 S.Ct. 1173, 167 L.Ed.2d 1 (2007); Hill, 277 Ga. at 257, 587 S.E.2d 613.

D. Perkins has claimed in summary fashion that his counsel rendered ineffective assistance in several general respects on direct appeal. We deem these unsupported claims to have been abandoned. See Supreme Court Rule 22; Hill, 277 Ga. at 269, 587 S.E.2d 613.

E. Perkins's remaining claims are barred by procedural default because they were not raised at trial and on direct appeal, including his claims that several witnesses committed perjury, that the State failed to correct false testimony, that the trial court erred by failing sua sponte to order its own inquiry into Perkins's competence, and that the prosecutor made improper arguments. Perkins has failed to even attempt to show cause and prejudice to overcome the bar to these procedurally defaulted claims. See Ferrell, 274 Ga. at 401, 554 S.E.2d 155.

Judgment affirmed in part, reversed in part, and case remanded with direction.

All the Justices concur, except HUNSTEIN, C.J., and BENHAM, J., who concur in part and dissent in part.

HUNSTEIN, Chief Justice, concurring in part and dissenting in part.

I agree with most of the majority's opinion in this case; however, I dissent to the majority's refusal to apply the miscarriage of justice exception to Perkins's claim that he was mentally incompetent at the time of his trial. Although the habeas court correctly applied this Court's existing case law, Perkins raises an issue never directly confronted by this Court. Perkins notes that the Eleventh Circuit Court of Appeals treats claims of incompetence at trial as never being subject to procedural default. That court bases its approach on language from the Supreme Court of the United States indicating that "`it is contradictory to argue that a defendant may be incompetent, and yet knowingly or intelligently "waive" his right to have the court determine his capacity to stand trial.'" Adams v. Wainwright, 764 F.2d 1356, 1359(II)(A)(1) (11th Cir.1985) (quoting Pate v. Robinson, 383 U.S. 375, 384(II), 86 S.Ct. 836, 15 L.Ed.2d 815 (1966)). See also Johnston v. Singletary, 162 F.3d 630, 637 (11th Cir.1998). Several other federal courts of appeals have also concluded that claims of incompetence that were not asserted at trial should not be subject to procedural default. See Ryan v. Clarke, 387 F.3d 785, 791(III) (8th Cir.2004) ("Pate stands for the specific proposition that a defendant who fails to raise competency at trial or on direct appeal does not waive his right to raise the issue in post conviction relief proceedings."); Nguyen v. Reynolds, 131 F.3d 1340(III) (10th Cir. 1997). But see Martinez-Villareal v. Lewis, 80 F.3d 1301, 1306-1307 (9th Cir.1996) (holding that procedural default should apply to claims of incompetence). While I find persuasive these federal courts' reasons for not treating the issue of incompetence at trial as being subject to procedural default, I would resolve this issue on a similar principle embodied in the Georgia Code and already applied by this Court in a similar situation.

The statute providing generally for procedural default where issues are not raised at trial and on direct appeal also provides as follows: "In all cases habeas corpus relief shall be granted to avoid a miscarriage of justice." OCGA § 9-14-48(d). We have applied this provision to cases where a death penalty defendant's mental retardation was not determined by a jury at trial but where he has succeeded in proving it on habeas corpus. See Turpin v. Hill, 269 Ga. 302(3)(b), 498 S.E.2d 52 (1998). In such cases, we have deemed the prohibition on executing the mentally retarded to be such a critical constitutional matter that allowing a waiver thereof would be a miscarriage of justice. Id. Similarly, I would hold now that the right not to be tried while incompetent is such a critical constitutional matter that permitting the waiver of that right by one who was truly incompetent at trial would constitute a miscarriage of justice. A defendant who was subjected to trial while incompetent was, in essence, personally absent from the entirety of his or her trial through no fault of his or her own. See Ling v. State, 288 Ga. 299(1), 702 S.E.2d 881 (2010). From the perspective of such a defendant, it is as though he or she was never afforded a trial at all. Thus, this situation is not, as the majority asserts, merely a procedural trial irregularity. Instead, it approaches the very absence of a trial. Under such circumstances, the core concerns of the miscarriage of justice exception are clearly implicated.

As we did regarding mental retardation, I would hold that the same standard should apply on habeas corpus as would have applied at trial. Id. at 303-304(4), 498 S.E.2d 52. The standard at trial for claims of incompetence is proof of incompetence by a preponderance of the evidence. See Lewis v. State, 279 Ga. 69, 70(3), 608 S.E.2d 602 (2005) ("A defendant bears the burden of establishing incompetency to stand trial by a preponderance of the evidence, and this burden is consistent with principles of due process."). Because the habeas court has not explicitly applied the standard that I believe we should adopt regarding claims of incompetence at trial, I would remand this matter for consideration of whether Perkins can prove now by a preponderance of the evidence that he was incompetent at the time of trial.

I am authorized to state that Justice BENHAM joins in this dissent.