Journal article

No sequence dependent modulation of the Simon effect in Parkinson's disease

J Fielding, N Georgiou-Karistianis, J Bradshaw, L Millist, O White

COGNITIVE BRAIN RESEARCH | ELSEVIER | Published : 2005

Abstract

This study sought to evaluate impaired response tendencies and modulation of automatic processes in Parkinson's disease (PD), utilising a saccadic Simon task with stimulus-response (S-R) compatibility determined on the basis of cue shape. The appearance of either a circle or a square in one of two boxes presented peripherally required the generation of a leftward or rightward horizontal saccade, respectively. These goal-directed responses were considered behaviourally relevant to an examination of visuospatial performance. Although response times are typically faster when stimulus and response are spatially compatible than when they are not, sequence-dependent modulation of this effect resul..

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