Response-repetition effects depend on motor set: evidence for anatomical coding in response selection.
Successful motor performance requires a process of response selection that chooses the correct response out of a set of possible ones. Most theories of response selection assume that this selection process operates on spatial codes, which define the location of stimuli and responses in environmental coordinates, with little or no role for the anatomical codes of the effectors involved. In this study, we tested this assumption by investigating response-repetition effects in a response-cuing paradigm using two motor sets (fingers on one hand vs. fingers on two hands). Reaction time results demonstrated a robust response-repetition benefit that was greater for the one-hand set than for the two-hands set. Furthermore, with the one-hand set the repetition benefit was independent of cue type and cue-stimulus interval on the previous trial, whereas with the two-hands set it was strongly modulated by these two factors. These differential response-repetition effects for one- and two-hands motor sets demonstrate the important role of the neuro-anatomical hand distinction in response selection, thereby supporting multiple coding notions.
Department of Movement Sciences, Institute of Mental Health and Neuroscience, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands. Electronic address: jos.adam@maastrichtuniversity.nl.
Jos J
JJ
Adam
Institute of Psychology, RWTH Aachen University, Jägerstr. 17/19, D-52056 Aachen, Germany. Electronic address: koch@psych.rwth-aachen.de.
Iring
I
Koch
D000328:Adult; D001288:Attention; D002755:Choice Behavior; D003463:Cues; D005260:Female; D007839:Functional Laterality; D006801:Humans; D008297:Male; D009949:Orientation; D011214:Practice, Psychological; D011597:Psychomotor Performance; D011930:Reaction Time; D055815:Young Adult
Neuro-anatomical organization; Reaction time; Response coding; Response preparation; Response repetition; Response selection; Response-cuing paradigm