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2015 ; 165
(1
): 70-5
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Motivation and effort in individuals with social anhedonia
#MMPMID25888337
McCarthy JM
; Treadway MT
; Blanchard JJ
Schizophr Res
2015[Jun]; 165
(1
): 70-5
PMID25888337
show ga
It has been proposed that anhedonia may, in part, reflect difficulties in reward
processing and effortful decision making. The current study aimed to replicate
previous findings of effortful decision making deficits associated with elevated
anhedonia and expand upon these findings by investigating whether these decision
making deficits are specific to elevated social anhedonia or are also associated
with elevated positive schizotypy characteristics. The current study compared
controls (n=40) to individuals elevated on social anhedonia (n=30), and
individuals elevated on perceptual aberration/magical ideation (n=30) on the
Effort Expenditure for Rewards Task (EEfRT). Across groups, participants chose a
higher proportion of hard tasks with increasing probability of reward and reward
magnitude, demonstrating sensitivity to probability and reward values. Contrary
to our expectations, when the probability of reward was most uncertain (50%
probability), at low and medium reward values, the social anhedonia group
demonstrated more effortful decision making than either individuals high in
positive schizotypy or controls. The positive schizotypy group only differed from
controls (making less effortful choices than controls) when reward probability
was lowest (12%) and the magnitude of reward was the smallest. Our results
suggest that social anhedonia is related to intact motivation and effort for
monetary rewards, but that individuals with this characteristic display a unique
and perhaps inefficient pattern of effort allocation when the probability of
reward is most uncertain. Future research is needed to better understand
effortful decision making and the processing of reward across a range of
individual difference characteristics.
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