Event-related brain potentials during selective attention to depth and form in global stereopsis

To elucidate the discriminating processes of surface depth and boundary for m in global stereopsis. event-related brain potentials (ERPs) were investig ated by the detection of combinations of the attributes in random sequences . The attentional relevance of depth or form was associated with selection negativities (SNs) over the lateral occipito-temporal regions initiating at about 200 ms post-stimulus. The initial SNs were elicited irrespective of relevance to the other feature: the following parts increased only for stim uli with crossed disparity having the relevant dimension of the other featu re, suggesting the independent selection of stereoscopic depth and form fol lowed by the perceptual integration into an object. (C) 2001 Elsevier Scien ce Ltd. All rights reserved.