title: The impact of stimulus and response variability on S-R correspondence effects.
abstract: Six experiments investigated how variability on irrelevant stimulus dimensions and variability on response dimensions contribute to spatial and nonspatial stimulus-response (S-R) correspondence effects. Experiments 1-3 showed that, when stimuli varied in location and number, S-R correspondence effects for location or numerosity occurred when responses varied on these dimensions but not when responses were invariant on these dimensions. These results are consistent with the response-discrimination account, according to which S-R correspondence effects should only arise for a dimension that is used for discriminating between responses in working memory. Experiments 4-6 showed that, when responses varied in location and number, both invariant and variable stimulus number produced correspondence effects in S-R numerosity. In summary, the present results indicate that the usefulness of a particular dimension for response discrimination can be sufficient for producing S-R correspondence effects, whereas variability of a stimulus dimension is not sufficient for producing such effects.
authors.affiliation: Institut für Psychologie I, Friedrich-Alexander-Universität, Erlangen, Germany. peter.wuehr@psy.phil.uni-erlangen.de
authors.forename: Peter
authors.initials: P
authors.lastname: Wühr
authors.forename: Rupert
authors.initials: R
authors.lastname: Biebl
authors.forename: Ulrich
authors.initials: U
authors.lastname: Ansorge
mesh_terms: D000293:Adolescent; D000328:Adult; D001245:Association Learning; D001288:Attention; D003220:Conflict, Psychological; D005260:Female; D007839:Functional Laterality; D006801:Humans; D008297:Male; D008570:Memory, Short-Term; D009949:Orientation; D010897:Pitch Discrimination; D011597:Psychomotor Performance; D011601:Psychophysics; D011930:Reaction Time; D013017:Sound Localization