UCLA

Schizophrenia is associated with amotivation and reduced goal-directed behavior, which have been linked to poor functional outcomes. Motivational deficits in schizophrenia are often measured using effort-based decision-making (EBDM) paradigms, revealing consistent alterations in effort expenditure relative to controls. Although these results have generally been interpreted in terms of decreased motivation, the ability to use trial-by-trial changes in reward magnitude or probability of receipt to guide effort allocation may also be affected by cognitive deficits. To date, it remains unclear whether altered performance in EBDM primarily reflects deficits in motivation, cognitive functioning, or both. We applied a newly developed computational modeling approach to the analysis of EBDM data from two previously collected samples comprising 153 patients and 105 controls to determine the extent to which individuals did or did not use available information about reward and probability to guide effort allocation. Half of the participants with schizophrenia failed to incorporate information about reward and probability when making effort-expenditure decisions. The subset of patients who exhibited difficulties using reward and probability information were characterized by greater impairments across measures of cognitive functioning. Interestingly, even within the subset of patients who successfully used reward and probability information to guide effort expenditure, higher levels of negative symptoms related to motivation and avolition were associated with greater effort aversion during the task. Taken together, these data suggest that prior reports of aberrant EBDM in schizophrenia patients are related to both cognitive function and individual differences in negative symptoms. (PsycINFO Database Record (c) 2019 APA, all rights reserved).