2003 Fiscal Year Final Research Report Summary
Why is change detection so difficult in change blindness?
| Project/Area Number |
14510090
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
実験系心理学
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| Research Institution | Tohoku University |
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Principal Investigator |
IWASAKI Shoichi Tohoku University, Graduate School of Information Sciences, Professor, 大学院・情報科学研究科, 教授 (90117656)
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| Project Period (FY) |
2002 – 2003
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| Keywords | change blindness / attentional capture / singleton / magnoellular neuron |
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| Research Abstract |
In change blindness, detection of a local change is known to be uniquely difficult. In the central nervous system, stimulus transiency caused by a local change is coded by the magnocellur neurons, which is known to be selectively suppressed by red color. Taking advantage of this fact, in the present study, change detection was tested with different background colors of equal luminance (red,green,and gray). Unlike traditional change blindness experiments, in the present study, a simple stimulus configuration with dots arranged on 3 concentric circles was used. There were four target locations where rings rather than dots were placed, one in each quadrant of the visual field. Thus, the change event was form change, in which one of the four rings turned into a star after presentation of a blank field. RTs for this change detection was measured under different background colors. To make change detection difficult, attentional capture by singleton (e.g., appearance of star) was prevented with additional stars added in advance around the target rings. It was found that when change did not make a singleton (that is, 4 stars were added in advance around each ring) change was especially difficult when background color was red in spite of the fact that the stimulus area (those where targets and noise stimuli were displayed) was cut out to make a black doughnut area.
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