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Time course of spatial and feature selective attention for partly-occluded objects
| Title: | Time course of spatial and feature selective attention for partly-occluded objects |
| Authors: | Kasai, Tetsuko Browse this author →KAKEN DB | | Takeya, Ryuji Browse this author |
| Keywords: | Attention | | Object | | Perception | | Amodal completion | | Event-related potential | | N1 |
| Issue Date: | Jul-2012 |
| Publisher: | Elsevier |
| Journal Title: | Neuropsychologia |
| Volume: | 50 |
| Issue: | 9 |
| Start Page: | 2281 |
| End Page: | 2289 |
| Publisher DOI: | 10.1016/j.neuropsychologia.2012.05.032 |
| PMID: | 22683447 |
| Abstract: | Attention selects objects/groups as the most fundamental units, and this may be achieved by an attention-spreading mechanism. Previous event-related potential (ERP) studies have found that attention-spreading is reflected by a decrease in the N1 spatial attention effect. The present study tested whether the electrophysiological attention effect is associated with the perception of object unity or amodal completion through the use of partly-occluded objects. ERPs were recorded in 14 participants who were required to pay attention to their left or right visual field and to press a button for a target shape in the attended field. Bilateral stimuli were presented rapidly, and were separated, connected, or connected behind an occluder. Behavioral performance in the connected and occluded conditions was worse than that in the separated condition, indicating that attention spread over perceptual object representations after amodal completion. Consistently, the late N1 spatial attention effect (180-220 ms post-stimulus) and the early phase (230-280 ms) of feature selection effects (target N2) at contralateral sites decreased, equally for the occluded and connected conditions, while the attention effect in the early N1 latency (140-180 ms) shifted most positively for the occluded condition. These results suggest that perceptual organization processes for object recognition transiently modulate spatial and feature selection processes in the visual cortex. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/50061 |
| Appears in Collections: | 教育学院・教育学研究院 (Graduate School of Education / Faculty of Education) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 河西 哲子
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