Citation

Valle-Inclán F. Int. J. Psychophysiol. 1996; 23(1-2): 41-53.

Affiliation

Departamento de Psicología, University de la Coruña, Elviña, Spain. fval@udc.es

Copyright

(Copyright © 1996, Elsevier Publishing)

DOI

unavailable

PMID

8880365

Abstract

The Simon effect (slower RT when stimulus and response locations do not match, stimulus location being irrelevant) and its reversal, were investigated using P300 latency and motor-related potentials. Stimuli were one of two colors, and response keys were two buttons with color labels that changed randomly in every trial. Depending on the stimulus-response (S-R) mapping instructions, subjects pressed the same-color key or the alternate-color key. Behavioral measures showed a Simon effect in same- and a reverse Simon effect in alternate-color mapping contradicting the display-control arrangement correspondence and the S-S compatibility, as explanations for the reverse Simon effect. P300 latencies followed the same pattern as RT, i.e. they were influenced by the S-R mapping, suggesting that this measure does not index the duration of the stimulus evaluation, but response selection processes. The motor-related potentials demonstrated response activation based on stimulus location, also supporting response- interference interpretations of the Simon effect.

Language: en