Time on timing : Dissociating premature responding from interval sensitivity in Parkinson's disease
(2016) In Movement Disorders 31(8). p.72-1163- Abstract
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... (More)
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. © 2016 The Authors. Movement Disorders published by Wiley Periodicals, Inc. on behalf of International Parkinson and Movement Disorder Society.
(Less)
- author
- Zhang, Jiaxiang ; Nombela, Cristina ; Wolpe, Noham ; Barker, Roger A LU and Rowe, James B
- publishing date
- 2016-08
- type
- Contribution to journal
- publication status
- published
- keywords
- Journal Article
- in
- Movement Disorders
- volume
- 31
- issue
- 8
- pages
- 10 pages
- publisher
- John Wiley & Sons Inc.
- external identifiers
-
- scopus:84964374743
- pmid:27091513
- ISSN
- 0885-3185
- DOI
- 10.1002/mds.26631
- language
- English
- LU publication?
- no
- id
- 0d1b0a8a-cc8f-4f21-ad12-77ee0d60f902
- date added to LUP
- 2016-11-23 13:09:24
- date last changed
- 2024-06-28 19:38:39
@article{0d1b0a8a-cc8f-4f21-ad12-77ee0d60f902, abstract = {{<p>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.</p><p>OBJECTIVES: This study assessed premature responding during time perception in PD.</p><p>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.</p><p>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).</p><p>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. © 2016 The Authors. Movement Disorders published by Wiley Periodicals, Inc. on behalf of International Parkinson and Movement Disorder Society.</p>}}, author = {{Zhang, Jiaxiang and Nombela, Cristina and Wolpe, Noham and Barker, Roger A and Rowe, James B}}, issn = {{0885-3185}}, keywords = {{Journal Article}}, language = {{eng}}, number = {{8}}, pages = {{72--1163}}, publisher = {{John Wiley & Sons Inc.}}, series = {{Movement Disorders}}, title = {{Time on timing : Dissociating premature responding from interval sensitivity in Parkinson's disease}}, url = {{http://dx.doi.org/10.1002/mds.26631}}, doi = {{10.1002/mds.26631}}, volume = {{31}}, year = {{2016}}, }