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• W2792056998 abstract "Impairments in cognitive control—the ability to exert control over thoughts and actions and respond flexibly to the environment—are well-documented in schizophrenia. However, the degree to which experimental task performance reflects true cognitive control impairments or more general alterations in effort, arousal and/or task preparedness is unclear. Pupillary responses can provide insight into these latter factors, as the pupil dilates with degree of cognitive effort and response preparation. In the current study, 16 medicated outpatients with schizophrenia (SZP) and 18 healthy controls performed a task that measures the ability to reactively inhibit and modify a planned action—the double-step task. In this task, participants were required to make a saccade to a visual target. Infrequently, the target jumped to a new location and participants were instructed to rapidly inhibit and change their eye movement plan. Applying a race model of performance, we have previously shown that SZP require more time to inhibit a planned action. In the current analysis, we measured pupil dilation associated with task preparation and found that SZP had a shallower increase in pupil size prior to the onset of the trial. Additionally, reduced magnitude of the pupil response was associated with negative symptom severity in patients. Based on primate neurophysiology and cognitive neuroscience work, we suggest that this blunted pupillary response may reflect abnormalities in a general orienting response or reduced motivational significance of a cue signifying the onset of a preparatory period and that these abnormalities might share an autonomic basis with negative symptoms." @default.
• W2792056998 created "2018-03-29" @default.
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• W2792056998 date "2018-06-01" @default.
• W2792056998 modified "2023-10-15" @default.
• W2792056998 title "Reduced pupil dilation during action preparation in schizophrenia" @default.
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• W2792056998 doi "https://doi.org/10.1016/j.ijpsycho.2018.03.012" @default.
• W2792056998 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5960624" @default.
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