Enlighten
Research publications by members of the University of Glasgow
home > services > Enlighten

Response priming in the Simon paradigm: A transcranial magnetic stimulation study

Stürmer, B., Siggelkow, S., Dengler, R., and Leuthold, H. (2000) Response priming in the Simon paradigm: A transcranial magnetic stimulation study. Experimental Brain Research, 135 (3). pp. 353-359.

Full text not currently available from Enlighten.

Abstract

The Simon effect refers to the finding of faster responses when stimulus and response locations correspond than when they do not, although a nonspatial stimulus feature is task-relevant. These performance differences are usually accounted for by response priming processes directly induced by the task-irrelevant stimulus location. The present study investigated neural mechanisms of response priming in a Simon task at the level of the motor cortex with the help of transcranial magnetic stimulation (TMS) and motor evoked potentials (MEPs) in both arms. A single TMS was applied contralateral or ipsilateral to the requested response at the time point where response priming was at a maximum. The MEP effects depended on the stimulated hemisphere. Over the left hemisphere, MEP areas were larger when TMS was applied over the primed motor cortex. However, reduced MEPs for the nonprimed hemisphere fell short of signifi-cance. Over the right hemisphere, only a MEP reduction for nonprimed left-hand responses was present. Therefore, we conclude that mainly excitatory activation underlies response priming in a Simon task, whereas the role of inhibitory processes is tentative.

Item Type:Article
Status:Published
Refereed:Yes
Glasgow Author(s):Leuthold, Prof Hartmut
Authors: Stürmer, B., Siggelkow, S., Dengler, R., and Leuthold, H.
College/School:College of Science and Engineering > School of Psychology
Journal Name:Experimental Brain Research

University Staff: Request a correction | Enlighten Editors: Update this record