title: The direction of hemispheric asymmetries for object categorization at different levels of abstraction depends on the task.
abstract: In this study hemispheric asymmetries for categorizing objects at the basic versus subordinate level of abstraction were investigated. As predictions derived from different theoretical approaches are contradictory and experimental evidence is inconclusive in this regard, we conducted two categorization experiments, where we contrasted two experimental paradigms. In the first experiment, subjects had to verify whether a word and a laterally presented picture matched or not. In the second experiment, subjects had to identify laterally presented pictures of animals either at the basic or subordinate level by pressing a corresponding response key. Whereas the first experiment revealed an advantage of the left hemisphere (LH) for categorizing objects at the basic level and of the right hemisphere (RH) for categorizing at the subordinate level, just the opposite brain asymmetry was found in the second experiment. As the stimuli were identical in both experiments, hemispheric asymmetries seem to be strongly task dependent.
authors.affiliation: Universität Konstanz, Fachbereich Psychologie, Fach D29, D-78457 Konstanz, Germany. tobias.studer@uni-konstanz.de
authors.forename: Tobias
authors.initials: T
authors.lastname: Studer
authors.forename: Ronald
authors.initials: R
authors.lastname: Hübner
mesh_terms: D000328:Adult; D001288:Attention; D004193:Discrimination Learning; D004292:Dominance, Cerebral; D005260:Female; D005364:Field Dependence-Independence; D006801:Humans; D008297:Male; D009949:Orientation; D010364:Pattern Recognition, Visual; D011340:Problem Solving; D011597:Psychomotor Performance; D011930:Reaction Time; D012660:Semantics; D014794:Visual Fields