Impaired effort allocation in schizophrenia

IF 3 Q2 PSYCHIATRY
Elodie Blouzard , Fabien Cignetti , Florent Meyniel , Arnaud Pouchon , Mircea Polosan , Julien Bastin , Clément Dondé
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Abstract

Background and hypothesis

Effort allocation is a crucial component of amotivation in schizophrenia. This study investigates the hypothesis that schizophrenia is associated with impairments in dynamic cost/benefit decision-making processes.

Study design

We employed a modified version of the effort allocation task developed by Meyniel et al. (2013). Participants were asked to allocate effort during 30-s intervals to maximize their gains. We examined the effects of task difficulty and incentive levels on participants' effort allocation on a trial-by-trial basis.

Study results

Individuals with schizophrenia (N = 25) showed decreased capacity to adapt dynamically to task parameters, as compared to healthy controls (N = 25). (1) Both populations increased the duration of each effort based on difficulty. Only healthy controls decreased rest duration based on incentive. The magnitude of these adaptations was significantly decreased in people with schizophrenia (difficulty: d = 1.25, incentive: d = 0.91). (2) Both groups decreased effort re-initiations with increasing difficulty with significant differences in the magnitude of adaptation between groups. (3) Participants with schizophrenia spent less time exerting effort above the required threshold, resulting in lower overall gains compared to healthy controls (η2 = 0.17).

Conclusions

Individuals with schizophrenia exhibit a selective impairment in effort-cost decision-making. This deficit may contribute to maladaptive behavior patterns characterized by suboptimal effort allocation and reduced goal-direct activities.
精神分裂症患者的努力分配受损
背景与假设努力分配是精神分裂症动机的重要组成部分。本研究探讨了精神分裂症与动态成本/收益决策过程障碍相关的假设。研究设计我们采用了Meyniel等人(2013)开发的改进版本的努力分配任务。参与者被要求在30秒的间隔内分配精力,以最大限度地提高他们的收益。我们在逐个试验的基础上检验了任务难度和激励水平对参与者努力分配的影响。研究结果:与健康对照(N = 25)相比,精神分裂症患者(N = 25)动态适应任务参数的能力下降。两个群体都根据难度增加了每次努力的持续时间。只有健康的对照组根据激励减少了休息时间。这些适应的程度在精神分裂症患者中显著降低(困难:d = 1.25,激励:d = 0.91)。(2)随着难度的增加,两组的努力再启动率均有所下降,且两组间的适应程度存在显著差异。(3)与健康对照组相比,精神分裂症患者花费在超过要求阈值的努力上的时间较少,导致总体收益较低(η2 = 0.17)。结论精神分裂症患者在努力-成本决策方面存在选择性障碍。这种缺陷可能导致以次优努力分配和目标直接活动减少为特征的不适应行为模式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
5.60
自引率
10.70%
发文量
54
审稿时长
67 days
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