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Time on timing: dissociating premature responding from interval sensitivity in Parkinson's disease

Zhang, Jiaxiang, Nobela, Cristina, Wolpe, Noham, Barker, Roger and Rowe, James 2016. Time on timing: dissociating premature responding from interval sensitivity in Parkinson's disease. Movement Disorders -New York- 31 (8) , pp. 1163-1172. 10.1002/mds.26631

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BACKGROUND: Parkinson's disease (PD) can cause impulsivity with premature responses, but there are several potential mechanisms. We proposed a distinction between poor decision-making and the distortion of temporal perception. Both effects may be present and interact, but with different clinical and pharmacological correlates. OBJECTIVES: This study assessed premature responding during time perception in PD. METHODS: In this study, 18 PD patients and 19 age-matched controls completed 2 temporal discrimination tasks (bisection and trisection) and a baseline reaction-time task. Timing sensitivity and decision-making processes were quantified by response and response time. An extended version of the modified difference model was used to examine the precision of time representation and the modulation of response time by stimulus ambiguity. RESULTS: In the bisection task, patients had a lower bisection point (P < .05) and reduced timing sensitivity when compared with controls (P < .001). In the trisection task, patients showed lower sensitivity in discriminating between short and medium standards (P < .05). The impairment in timing sensitivity correlated positively with patients' levodopa dose equivalent (P < .05). Critically, patients had disproportionately faster response times when compared with controls in more ambiguous conditions, and the degree of acceleration of response time increased with disease severity (P < .05). Computational modeling indicated that patients had poorer precision in time representation and stronger modulation of response time by task ambiguity, leading to smaller scaling of the decision latency (P < .05). CONCLUSIONS: These findings suggest that timing deficits in PD cannot be solely attributed to perceptual distortions, but are also associated with impulsive decision strategies that bias patients toward premature responses.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Publisher: Wiley-Blackwell
ISSN: 0885-3185
Date of First Compliant Deposit: 22 April 2016
Date of Acceptance: 7 March 2016
Last Modified: 30 Apr 2019 13:59

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