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Object-based spatial attention when objects have sufficient depth cues

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Title: Object-based spatial attention when objects have sufficient depth cues
Authors: Takeya, Ryuji Browse this author
Kasai, Tetsuko Browse this author →KAKEN DB
Issue Date: Sep-2015
Publisher: Association for Research in Vision and Ophthalmology
Journal Title: Journal of Vision
Volume: 15
Issue: 13
Start Page: 16
Publisher DOI: 10.1167/15.13.16
Abstract: Attention directed to a part of an object tends to obligatorily spread over all of the spatial regions that belong to the object, which may be critical for rapid object-recognition in cluttered visual scenes. Previous studies have generally used simple rectangles as objects and have shown that attention spreading is reflected by amplitude modulation in the posterior N1 component (150-200 ms poststimulus) of event-related potentials, while other interpretations (i.e., rectangular holes) may arise implicitly in early visual processing stages. By using modified Kanizsa-type stimuli that provided less ambiguity of depth ordering, the present study examined early event-related potential spatial-attention effects for connected and separated objects, both of which were perceived in front of (Experiment 1) and in back of (Experiment 2) the surroundings. Typical P1 (100-140 ms) and N1 (150-220 ms) attention effects of ERP in response to unilateral probes were observed in both experiments. Importantly, the P1 attention effect was decreased for connected objects compared to separated objects only in Experiment 1, and the typical object-based modulations of N1 were not observed in either experiment. These results suggest that spatial attention spreads over a figural object at earlier stages of processing than previously indicated, in three-dimensional visual scenes with multiple depth cues.
Type: article (author version)
URI: http://hdl.handle.net/2115/67312
Appears in Collections:医学院・医学研究院 (Graduate School of Medicine / Faculty of Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 竹谷 隆司

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