RESEARCH
ARTICLE
Time on Timing: Dissociating Premature Responding From Interval Sensitivity in Parkinson’s Disease Jiaxiang Zhang, PhD,1,2* Cristina Nombela, PhD,3 Noham Wolpe, PhD,2,3 Roger A. Barker, MRCP, PhD,3 and James B. Rowe, MRCP, PhD2,3 1
Cardiff University Brain Research Imaging Centre, School of Psychology, Cardiff University, Cardiff, UK 2 Cognition and Brain Sciences Unit, Medical Research Council, Cambridge, UK 3 Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
A B S T R A C T : B a c k g r o u n d : 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. O b j e c t i v e s : This study assessed premature responding during time perception in PD. M e t h o d s : In this study, 18 PD patients and 19 agematched controls completed 2 temporal discrimination tasks (bisection and trisection) and a baseline reactiontime 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. R e s u l t s : In the bisection task, patients had a lower bisection point (P
ARTICLE
Time on Timing: Dissociating Premature Responding From Interval Sensitivity in Parkinson’s Disease Jiaxiang Zhang, PhD,1,2* Cristina Nombela, PhD,3 Noham Wolpe, PhD,2,3 Roger A. Barker, MRCP, PhD,3 and James B. Rowe, MRCP, PhD2,3 1
Cardiff University Brain Research Imaging Centre, School of Psychology, Cardiff University, Cardiff, UK 2 Cognition and Brain Sciences Unit, Medical Research Council, Cambridge, UK 3 Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
A B S T R A C T : B a c k g r o u n d : 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. O b j e c t i v e s : This study assessed premature responding during time perception in PD. M e t h o d s : In this study, 18 PD patients and 19 agematched controls completed 2 temporal discrimination tasks (bisection and trisection) and a baseline reactiontime 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. R e s u l t s : In the bisection task, patients had a lower bisection point (P
