Steeper discounting of delayed rewards in schizophrenia but not first-degree relatives.

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TitleSteeper discounting of delayed rewards in schizophrenia but not first-degree relatives.
Publication TypeJournal Article
Year of Publication2017
AuthorsYu, LQ, Lee, S, Katchmar, N, Satterthwaite, TD, Kable, JW, Wolf, DH
JournalPsychiatry Res
Volume252
Pagination303-309
Date Published2017 06
ISSN1872-7123
KeywordsAdult, Case-Control Studies, Cognitive Dysfunction, Delay Discounting, Family, Female, Humans, Male, Reward, Risk-Taking, Schizophrenia, Schizophrenic Psychology
Abstract

Excessive discounting of future rewards has been related to a variety of risky behaviors and adverse clinical conditions. Prior work examining delay discounting in schizophrenia suggests an elevated discount rate. However, it remains uncertain whether this reflects the disease process itself or an underlying genetic vulnerability, whether it is selective for delay discounting or reflects pervasive changes in decision-making, and whether it is driven by specific clinical dimensions such as cognitive impairment. Here we investigated delay discounting, as well as loss aversion and risk aversion, in three groups: schizophrenia (SZ), unaffected first-degree family members (FM), and controls without a family history of psychosis (NC). SZ had elevated discounting, without changes in loss aversion or risk aversion. Contrary to expectations, the FM group did not show an intermediate phenotype in discounting. Higher discount rates correlated with lower cognitive performance on verbal reasoning, but this did not explain elevated discount rates in SZ. Group differences were driven primarily by the non-smoking majority of the sample. This study provides further evidence for elevated discounting in schizophrenia, and demonstrates that steeper discounting is not necessarily associated with familial risk, cannot be wholly accounted for by cognitive deficits, and is not attributable to smoking-related impulsivity.

DOI10.1016/j.psychres.2017.02.062
Alternate JournalPsychiatry Res
PubMed ID28301828
PubMed Central IDPMC5438888
Grant ListK23 MH098130 / MH / NIMH NIH HHS / United States
R01 MH112070 / MH / NIMH NIH HHS / United States
R01 MH101111 / MH / NIMH NIH HHS / United States
K23 MH085096 / MH / NIMH NIH HHS / United States
R01 MH107703 / MH / NIMH NIH HHS / United States