Selective processing of superimposed objects: An electrophysiological analysis of object-based attentional selection

Timothy A. Weber, Arthur F. Kramer, Gregory A. Miller

Research output: Contribution to journalArticlepeer-review

Abstract

We investigated whether object-based attentional selection occurs from grouped-array or spatially-invariant representations. Subjects were presented with colored objects and asked to judge whether a particular color/shape conjunction was present, regardless of whether the color and shape were part of a single object (same-object condition) or occurred on two different objects (different-object condition). RTs and accuracies were recorded for subjects judgments. ERP components, in particular the P1 and N1. were elicited both from the presentation of the target objects and from a post-display probe that was employed as an index of spatial attention. Consistent with predictions of object-based selection models, RTs and accuracies were faster on same than on different object trials. N1s elicited by the target objects and P1s elicited by the post-display probes discriminated between same and different object trials when the two target objects were superimposed. These data are consistent with the proposal that object-based selection is spatially mediated, even in the case of partially overlapping objects. The data are discussed in terms of space- and object-based models of visual selective attention.

Original languageEnglish (US)
Pages (from-to)159-182
Number of pages24
JournalBiological Psychology
Volume45
Issue number1-3
DOIs
StatePublished - Mar 21 1997

Keywords

  • ERPs
  • Object representation
  • Object-based attention
  • Spatial attention

ASJC Scopus subject areas

  • Neuroscience(all)
  • Neuropsychology and Physiological Psychology

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