First let us identify what are psychiatrics symptoms found in decision makers
eccentric people generally have been strong decision makers and great administrators though these achievements were not good on scale of mortality and public welfare and adverse cost to nation or society. same thing happens in corporates also ( Indira Gandhi, Adolf Hitler, Saddam Hussain
Depression (Hindmarch et al., 2005; Larkin & Hutton, 2007)
Stress-related Disorders (Linn et al., 2011)
Obsessive-Compulsive Disorder (OCD) (Moulding et al., 2015)
Cognitive Impairment (Grisso & Appelbaum, 1995)
Psychotic Disorders (Sullivan & Youngner, 1994; Hindmarch et al., 2005)
Here are the references in APA format related to psychiatric symptoms and decision-making capacity:
Appelbaum, P. S., Grisso, T., & Frank, E. (1999). MacArthur competence assessment tool for treatment: A clinical tool for assessing competence to make treatment decisions. Psychiatric Services, 50(5), 609–614. https://doi.org/10.1176/appi.ps.50.5.609
Grisso, T., & Appelbaum, P. S. (1995). Assessing competence to consent to treatment: A guide for physicians and other health professionals. Oxford University Press.
Halpern, S. D. (2012). Depression and decision-making capacity for treatment or research: A systematic review. BMC Medical Ethics, 13(1), 26. https://doi.org/10.1186/1472-6939-13-26
Larkin, H., & Hutton, N. (2007). The effect of psychotic symptoms on decision-making capacity and its assessment. Psychiatrist, 31(7), 32-34. https://doi.org/10.1192/pb.31.7.32
Rudnick, A. (2002). Cognitive and emotional impairments in decision-making capacity: A study of patients with major depression. Journal of Clinical Ethics, 13(4), 376–383. https://doi.org/10.1080/0748118021000048351
Sullivan, P. F., & Youngner, S. J. (1994). The relationship between emotion and decision-making capacity in individuals with depression. The Journal of Clinical Psychiatry, 55(4), 149–156.
Hindmarch, W. L., et al. (2005). Depression and decision-making capacity: A systematic review. BMC Medical Ethics, 9, 23. https://doi.org/10.1186/1472-6939-9-23
The Psychiatrist. (2009). The effect of psychotic symptoms on decision-making capacity in a patient with schizoaffective disorder. Psychiatrist, 33(6), 206–209. https://doi.org/10.1192/pb.bp.108.023530
These references include both general discussions on the effect of psychiatric symptoms on DMC, as well as specific studies focusing on depression and psychosis.
"Scientists have found two ‘dials’ in the brain that help to explain how chronic stress hijacks decision-making in mice. In a study, hungry mice were taught to push a lever to receive tasty pellets. Once they’d been fed, mice exposed to mild stressors continued to push the lever, but unstressed mice didn’t bother much. The team traced these behaviours to two pathways leading from the brain region called the amygdala to another called the striatum. One was only active in unstressed mice, hinting that it enables flexible decision-making and is dampened by prolonged stress. The second was only active in stressed mice, suggesting that it promotes reliance on habit."