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Neuropsychology. 2016 Sep;30(6):685-96. doi: 10.1037/neu0000284. Epub 2016 Apr 7.

Neural substrates of the impaired effort expenditure decision making in schizophrenia.

Author information

1
Neuropsychology and Applied Cognitive Neuroscience Laboratory, Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences.
2
Institute of Education, Rural Children and Adolescents Research Center for Health Promotion, Hunan Agricultural University.
3
School of Public Health, Central South University.
4
Mental Health Institute of Second Xiangya Hospital, National Technology Institute of Psychiatry, Key Laboratory of Psychiatry and Mental Health of Hunan Province, Central South University.
5
Castle Peak Hospital, Hong Kong Special Administrative Region.

Abstract

OBJECTIVE:

Unwillingness to expend more effort to pursue high value rewards has been associated with motivational anhedonia in schizophrenia (SCZ) and abnormal dopamine activity in the nucleus accumbens (NAcc). The authors hypothesized that dysfunction of the NAcc and the associated forebrain regions are involved in the impaired effort expenditure decision-making of SCZ.

METHOD:

A 2 (reward magnitude: low vs. high) × 3 (probability: 20% vs. 50% vs. 80%) event-related fMRI design in the effort-expenditure for reward task (EEfRT) was used to examine the neural response of 23 SCZ patients and 23 demographically matched control participants when the participants made effort expenditure decisions to pursue uncertain rewards.

RESULTS:

SCZ patients were significantly less likely to expend high level of effort in the medium (50%) and high (80%) probability conditions than healthy controls. The neural response in the NAcc, the posterior cingulate gyrus and the left medial frontal gyrus in SCZ patients were weaker than healthy controls and did not linearly increase with an increase in reward magnitude and probability. Moreover, NAcc activity was positively correlated with the willingness to expend high-level effort and concrete consummatory pleasure experience.

CONCLUSION:

NAcc and posterior cingulate dysfunctions in SCZ patients may be involved in their impaired effort expenditure decision-making. (PsycINFO Database Record

PMID:
27054437
DOI:
10.1037/neu0000284
[Indexed for MEDLINE]

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