Levin, J.
The question, as stated by defendant-appellant City of Highland Park, is whether "the Workers’ Compensation Appeal Board err[ed] as a matter of law by not applying the chain-of-causation test to determine whether or not the deceased’s suicide resulted from a personal injury [4]*4arising out of and in the course of employment.” We hold that the WCAB did not so err, and affirm.
I
Arlie C. Hammons committed suicide on December 26, 1974. Pamela Hammons, his former wife, filed a claim for death benefits under the workers’ compensation act on her own behalf and on behalf of her minor children. A hearing referee denied benefits. The WCAB reversed and awarded benefits "having found that decedent’s profound emotional disorder, which led to his suicide, was produced by a combination of non-work-related and work-related factors. Deziel v Difco Laboratories, Inc (After Remand), 403 Mich 1 [268 NW2d 1] (1978).”
Hammons, an 18-year veteran of the Highland Park Police Department, had advanced to the rank of corporal and was working as an acting temporary sergeant at the time of his death. The WCAB appears to have adopted the testimony of witnesses who "all agreed that [Hammons] desperately wanted and strove for a promotion to sergeant in 1974.” He had taken a promotional examination in 1972 and was at the top of the list. One week before his death, he learned that "his chances for future promotion were considerably reduced.”1 The WCAB said, adopting the testimony of witnesses, that his reaction was to become "very upset” and "very depressed.” Detective Grimm [5]*5related a conversation with Hammons on the morning of his death that "revolved around decedent’s depression about the dropping of the complaint [to require the city to restore sergeant posts that it had eliminated] and his feeling that he would never get the promotion that he so very greatly wanted. It appeared that decedent had been crying.” In addition, Hammons was disturbed about having to return to the ranks after working as acting sergeant. Hammons told his son that "he didn’t feel that he would be able to work with his fellow officers again because of the bad feelings” created when he "had to supervise and report on” them. The opinion of the WCAB referred to a note, written by Hammons immediately before his death, that said:
"Where is the End (ask Grimm). The pressure & the agony is just too great to bear. To notify [an aunt, a cousin, and sons and daughters] Love to all. Arlie C. Hammons.” "Ace,” "I have been very unhappy the last 30 years.” (Emphasis in the original.)
The WCAB stated that its review of the record persuaded it that Hammons’ "desire for advancement was a major subject of discussion and preoccupation during his final year of life.” The WCAB found "that his disappointment in this endeavor, coupled with real and with anticipated problems with co-workers, were major factors in the development of decedent’s extreme depression and resultant suicide.” The WCAB said that it had rejected testimony of the city’s expert witness that Hammons’ "emotional state and death were the direct result of his non-work-related problems and not at all contributed to by any difficulties in his employment. We find more reasonable the opinion of [Mrs. Hammons’ expert witness] that both work-[6]*6related and non-work-related problems combined to produce decedent’s illness and death. The existence of those non-work-related difficulties does not negate the compensability of the work-related factors. Kepsel v McCready & Sons, 345 Mich 335 [76 NW2d 30] (1956).”2
[7]*7The WCAB denied Mrs. Hammons benefits, stating that she is precluded from obtaining benefits because she was no longer married to or living with Hammons at the time of his death.3 Death benefits were awarded to daughters born in 1960 and 1966.4
The Court of Appeals denied leave to appeal. This Court granted leave to appeal.5 The only issue on this appeal is whether benefits were properly awarded to Hammons’ daughters._
[8]*8II
The City of Highland Park contends that this Court should adopt the "chain of causation” test for determining when a worker’s death by suicide is the result of "a personal injury arising out of and in the course of employment.”6 This test was favored by Justice Souris and two other justices in Trombley v Coldwater State Home & Training School, 366 Mich 649, 669; 115 NW2d 561 (1962), where a decision of the WCAB awarding compensation to the widow of a worker who had committed suicide during the course of a legislative investigation of alleged mistreatment of patients at a mental institution where the worker was an attendant nurse was affirmed by an equally divided Court. The other three justices sitting in the case, in an opinion by Justice Carr, said that compensation should be denied because the general rule, as set forth in Sponatski’s Case, 220 Mass 526; 108 NE 466 (1915), and subsequent decisions, is that workers’ compensation benefits are not recoverable because of the suicide of a worker "injured in the course of his employment, such injury arising therefrom, unless as a proven result the suicide has occurred in a moment of insane frenzy or because of irresistible impulse. Deliberate planning of an act of suicide, with mental ability to understand the nature of the act, involves the introduction of an intervening cause in the chain of circumstances to which cause the death must be attributed.” Trombley, p 660. Justice Carr concluded that Trombley’s mental condition was not the result of a physical injury sustained in the course of employment, as the evidence showed planning, not an act committed in an emotional or [9]*9insane frenzy or in obedience to an irresistible or uncontrollable impulse. Id., pp 658, 660, 661.
The city asserts that the WCAB applied still a third test, the "honest, though mistaken, perception” test stated in Deziel v Difco Laboratories, Inc, supra,7 and notes that the Court of Appeals, after decision by the WCAB in the instant case, adopted the Deziel test in another case. Lopucki v Ford Motor Co, 109 Mich App 231, 235; 311 NW2d 338 (1981).
We agree with the city that the chain-of-causation test is the correct test, but are satisfied that the WCAB applied that test and not the Deziel test.
Ill
The first inquiry is whether the worker who committed suicide received "a personal injury arising out of and in the course of employment.”8 The second inquiry, the Sponatski-Trombley question, is whether there is an adequate causal nexus between the work-related injury and the suicide.
A
We first consider whether Hammons received "a [10]*10personal injury arising out of and in the course of employment.” Justice Souris observed in Trombley that this Court had "held that compensation benefits are payable for incapacity to work because of a claimant’s mental disorder arising out of and in the course of his employment, whether or not such mental disorder results from a direct physical blow to claimant’s body.”9
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Levin, J.
The question, as stated by defendant-appellant City of Highland Park, is whether "the Workers’ Compensation Appeal Board err[ed] as a matter of law by not applying the chain-of-causation test to determine whether or not the deceased’s suicide resulted from a personal injury [4]*4arising out of and in the course of employment.” We hold that the WCAB did not so err, and affirm.
I
Arlie C. Hammons committed suicide on December 26, 1974. Pamela Hammons, his former wife, filed a claim for death benefits under the workers’ compensation act on her own behalf and on behalf of her minor children. A hearing referee denied benefits. The WCAB reversed and awarded benefits "having found that decedent’s profound emotional disorder, which led to his suicide, was produced by a combination of non-work-related and work-related factors. Deziel v Difco Laboratories, Inc (After Remand), 403 Mich 1 [268 NW2d 1] (1978).”
Hammons, an 18-year veteran of the Highland Park Police Department, had advanced to the rank of corporal and was working as an acting temporary sergeant at the time of his death. The WCAB appears to have adopted the testimony of witnesses who "all agreed that [Hammons] desperately wanted and strove for a promotion to sergeant in 1974.” He had taken a promotional examination in 1972 and was at the top of the list. One week before his death, he learned that "his chances for future promotion were considerably reduced.”1 The WCAB said, adopting the testimony of witnesses, that his reaction was to become "very upset” and "very depressed.” Detective Grimm [5]*5related a conversation with Hammons on the morning of his death that "revolved around decedent’s depression about the dropping of the complaint [to require the city to restore sergeant posts that it had eliminated] and his feeling that he would never get the promotion that he so very greatly wanted. It appeared that decedent had been crying.” In addition, Hammons was disturbed about having to return to the ranks after working as acting sergeant. Hammons told his son that "he didn’t feel that he would be able to work with his fellow officers again because of the bad feelings” created when he "had to supervise and report on” them. The opinion of the WCAB referred to a note, written by Hammons immediately before his death, that said:
"Where is the End (ask Grimm). The pressure & the agony is just too great to bear. To notify [an aunt, a cousin, and sons and daughters] Love to all. Arlie C. Hammons.” "Ace,” "I have been very unhappy the last 30 years.” (Emphasis in the original.)
The WCAB stated that its review of the record persuaded it that Hammons’ "desire for advancement was a major subject of discussion and preoccupation during his final year of life.” The WCAB found "that his disappointment in this endeavor, coupled with real and with anticipated problems with co-workers, were major factors in the development of decedent’s extreme depression and resultant suicide.” The WCAB said that it had rejected testimony of the city’s expert witness that Hammons’ "emotional state and death were the direct result of his non-work-related problems and not at all contributed to by any difficulties in his employment. We find more reasonable the opinion of [Mrs. Hammons’ expert witness] that both work-[6]*6related and non-work-related problems combined to produce decedent’s illness and death. The existence of those non-work-related difficulties does not negate the compensability of the work-related factors. Kepsel v McCready & Sons, 345 Mich 335 [76 NW2d 30] (1956).”2
[7]*7The WCAB denied Mrs. Hammons benefits, stating that she is precluded from obtaining benefits because she was no longer married to or living with Hammons at the time of his death.3 Death benefits were awarded to daughters born in 1960 and 1966.4
The Court of Appeals denied leave to appeal. This Court granted leave to appeal.5 The only issue on this appeal is whether benefits were properly awarded to Hammons’ daughters._
[8]*8II
The City of Highland Park contends that this Court should adopt the "chain of causation” test for determining when a worker’s death by suicide is the result of "a personal injury arising out of and in the course of employment.”6 This test was favored by Justice Souris and two other justices in Trombley v Coldwater State Home & Training School, 366 Mich 649, 669; 115 NW2d 561 (1962), where a decision of the WCAB awarding compensation to the widow of a worker who had committed suicide during the course of a legislative investigation of alleged mistreatment of patients at a mental institution where the worker was an attendant nurse was affirmed by an equally divided Court. The other three justices sitting in the case, in an opinion by Justice Carr, said that compensation should be denied because the general rule, as set forth in Sponatski’s Case, 220 Mass 526; 108 NE 466 (1915), and subsequent decisions, is that workers’ compensation benefits are not recoverable because of the suicide of a worker "injured in the course of his employment, such injury arising therefrom, unless as a proven result the suicide has occurred in a moment of insane frenzy or because of irresistible impulse. Deliberate planning of an act of suicide, with mental ability to understand the nature of the act, involves the introduction of an intervening cause in the chain of circumstances to which cause the death must be attributed.” Trombley, p 660. Justice Carr concluded that Trombley’s mental condition was not the result of a physical injury sustained in the course of employment, as the evidence showed planning, not an act committed in an emotional or [9]*9insane frenzy or in obedience to an irresistible or uncontrollable impulse. Id., pp 658, 660, 661.
The city asserts that the WCAB applied still a third test, the "honest, though mistaken, perception” test stated in Deziel v Difco Laboratories, Inc, supra,7 and notes that the Court of Appeals, after decision by the WCAB in the instant case, adopted the Deziel test in another case. Lopucki v Ford Motor Co, 109 Mich App 231, 235; 311 NW2d 338 (1981).
We agree with the city that the chain-of-causation test is the correct test, but are satisfied that the WCAB applied that test and not the Deziel test.
Ill
The first inquiry is whether the worker who committed suicide received "a personal injury arising out of and in the course of employment.”8 The second inquiry, the Sponatski-Trombley question, is whether there is an adequate causal nexus between the work-related injury and the suicide.
A
We first consider whether Hammons received "a [10]*10personal injury arising out of and in the course of employment.” Justice Souris observed in Trombley that this Court had "held that compensation benefits are payable for incapacity to work because of a claimant’s mental disorder arising out of and in the course of his employment, whether or not such mental disorder results from a direct physical blow to claimant’s body.”9 That construction of the act is now well established.10
The finding of the WCAB that Hammons had suffered a "profound emotional disorder” which led him to commit suicide supports the implicit finding of the WCAB that Hammons received a "personal injury.” The further finding that this injury arose out of and in the course of the employment acknowledged that both work-related [11]*11and non-work-related11 factors led to Hammons’ emotional disorder. Both Deziel12 and Kepsel,13 relied on by the WCAB, together with other authorities,14 fully support the conclusion of the WCAB [12]*12that "[t]he existence of those non-work-related difficulties does not negate the compensability of the work-related factors.” The WCAB’s conclusion that Hammons suffered a personal injury in the form of mental illness arising out of and in the course of the employment appears to have been reached by analysis conforming to the applicable rules of law.
B
We turn to the second inquiry, the adequacy of the causal nexus between the work-related injury and the suicide. In Sponatski', supra, the Supreme Judicial Court of Massachusetts affirmed an award of compensation based on a finding by the administrative tribunal that the worker, while insane as a result of his injury and acting from an uncontrollable impulse, threw himself from a window and was fatally injured. Although not necessary to decision, the Court stated in dictum a rule that came to be adopted in a majority of jurisdictions.15 The Court said that where, as in the case before the Court, "there follows as the direct result of a physical injury an insanity of such violence as to cause the victim to take his own life through an uncontrollable impulse or in a delirium of frenzy 'without conscious volition to produce death, having knowledge of the physical nature and consequences of the act,’ then there is a direct and unbroken causal connection between the physical injury and the death. But where the resulting insanity is such as to cause suicide through a [13]*13voluntary wilful choice determined by a moderately intelligent mental power which knows the purpose and the physical effect of the suicide act even though the choice is dominated and ruled by a disordered mind, then there is a new and independent agency which breaks the chain of causation arising from the injury.” Sponatski, supra, p 530.
The Sponatski formulation requires a mental illness of such severity as to cause the victim to take his own life through an uncontrollable impulse or in a delirium of frenzy without conscious volition.16 In Trombley, supra, Justice Souris and two other justices were of the opinion that although the workers’ compensation benefits awarded to Trombley’s widow could be affirmed in the application of the Sponatski voluntary-wilful choice test or the chain-of-causation test, the Sponatski test should be rejected.17_
[14]*14We agree with Justice Souris, the city, Professor Larson,18 and commentators generally,19 who have urged the adoption of the chain-of-causation test, that the questions of causation or intervening causation and intention should not turn on whether the worker knows what he is doing. A mind disoriented by physical or mental pain may be so impaired in its reasoning capacity that, although aware of the choices, it is incapable of rational choice.20
[15]*15The requisite causal connection between a work-related injury and death is not broken by an act that is the product of work-related mental injury and resulting impaired capacity for rational decision and choice. The impairment in the capacity for rational decision-making and an act of suicide resulting from such impairment are consequences of the mental injury and not separate or intervening causes. If the work results in mental injury and the mental injury results in suicide, the suicide is compensable.
The WCAB found that Hammons’ profound emotional disorder "led to his suicide.” It spoke of "decedent’s extreme depression and resultant suicide.” It said that the work-related and non-work-related problems combined to "produce decedent’s [16]*16illness and death.” The findings appear to be straightforward applications of the chain-of-causation test, and, again, were in conformity with the applicable rules of law.
C
In Lopucki, supra, pp 235-236, the Court of Appeals adopted a Deziel analysis for suicide cases:
"We require a different approach. Due to the Michigan Supreme Court’s decision in Deziel v Difco Laboratories, Inc, 403 Mich 1; 268 NW2d 1 (1978), the theory of an intervening intermediate cause of the suicide is not a viable theory in Michigan. Such theory assumes the existence of a rational part of the brain which chooses suicide despite the survival instinct and this rational portion of the brain is the 'actual’ cause of the suicide. The Deziel decision eliminated the requirement of showing any 'actual’ causal nexus between the employment and the injury. It is now sufficient if a strictly subjective causal nexus is supplied. If it is factually established that a claimant honestly, though mistakenly, perceived some personal injury incurred during his employment caused his disability, then he is entitled to compensation.”
In neither Lopucki nor the instant case was there a finding that the worker’s mental illness or suicide was caused by his non-work-related problems although he "honestly believed” that his work-related problems were the cause of his mental illness. Since compensation was neither sought nor awarded on the basis of "honest perception” and the WCAB could not have been guided by Lopucki, which was decided after the instant case was decided, we see no reason to remand for further factfinding out of concern that the departures from the chain-of-causation test in Lopucki may have occasioned the award in the instant case.
[17]*17The citation of Deziel by the WCAB in the instant case appears, in context, to relate to the portion of Deziel recognizing the difficulty in determining "the causal significance of any one factor,” and that nevertheless compensation may be awarded if there is a work-related factor.21
IV
In Selk v Detroit Plastic Products (On Resubmission), 419 Mich 32; 348 NW2d 652 (1984), this Court held'that the increase in the interest rate effected by 1981 PA 19422 from 5% to 12% per annum is retroactive to the date each weekly payment of workers’ compensation benefits was due if the compensation is paid after January 1, 1982, pursuant to an award of a hearing referee, the WCAB,23 or a court.24
Affirmed, and remanded to the WCAB for the computation of interest.
Williams, C.J., and Kavanagh and Cavanagh, JJ., concurred with Levin, J.