Categorization and category effects in normal object recognition - A PET Study

To investigate the neural correlates of the structural and semantic stages of visual object recognition and to see whether any effects of category cou ld be found at these stages, we compared the rCBF associated with two categ orization tasks (subjects decided whether pictures represented artefacts or natural objects), and two object decision tasks (subjects decided whether pictures represented real objects or nonobjects). The categorization tasks differed from each other in that the items presented in the critical scan w indow were drawn primarily from the category of artefacts in the one task a nd from the category of natural objects in the other. The same was true for the object decision tasks. The experiment thus comprised a two-by-two fact orial design. The factors were Task Type with two levels (object decision v s. categorization) and Category also with two levels (natural objects vs. a rtefacts). The object decision tasks were associated with activation of are as involved in structural processing (fusiform gyri, right inferior frontal gyrus). In contrast, the categorization tasks were associated with activat ion of the left inferior temporal gyrus, a structure believed to be involve d in semantic processing. In addition, activation of the left premotor cort ex was found during the categorization of artefacts compared with both the categorization of natural objects and object decision to artefacts. These f indings suggest that the structural and semantic stages are dissociable and that the categorization of artefacts, as opposed to the categorization of natural objects, is based, in part, on action knowledge mediated by the lef t premotor cortex. However, because artefacts and natural objects often cau sed activation in the same regions within tasks, processing of these catego ries is not totally segregated. Rather, the categories differ in their weig ht on different forms of knowledge in particular tasks. (C) 2000 Elsevier S cience Ltd. All rights reserved.