Object-based selection: the role of attentional shifts

Perception & Psychophysics
D Lamy, Howard Egeth

Abstract

The objective of this paper was to investigate under what conditions object-based effects are observed. Recently, Watson and Kramer (1999) used a divided-attention task and showed that unless top-down factors induce a bias toward selection at a higher level, object-based effects are obtained when same-object targets belong to the same uniformly connected (single-UC) region, but not when they belong to different single-UC regions grouped into a higher order object (grouped-UC regions). We refine this claim by proposing that a critical factor in determining whether or not object-based effects with grouped-UC regions are observed is the need to shift attention. The results of four experiments support this hypothesis. Stimuli and displays were similar to those used by Egly, Driver, and Rafal (1994). Subjects had to make size judgments. Using different paradigms, we obtained object-based effects when the task required shifts of attention (spatial cuing, same vs. different judgment with asynchronous target onsets), but not when attention remained either broadly distributed (same vs. different judgment with simultaneous targets) or tightly focused (response competition paradigm).

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Citations

Oct 31, 2003·Journal of Experimental Psychology. Human Perception and Performance·Morris Goldsmith, Menahem Yeari
Jul 19, 2006·Journal of Experimental Psychology. Human Perception and Performance·Jonathan I Flombaum, Brian J Scholl
Jun 29, 2006·Journal of Experimental Psychology. Applied·Siné McDougallSimon Folkard
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Apr 19, 2006·Perception & Psychophysics·Dominique LamyLital Ruderman
Jun 16, 2006·Perception & Psychophysics·Judith Avrahami
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