Adaptive changes appearing as aftereffects of visual adaptation

2014 Fiscal Year Final Research Report

• Project/Area Number: 23243076
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Experimental psychology
• Research Institution: Kyushu University
• Principal Investigator: ITO Hiroyuki 九州大学, 芸術工学研究科(研究院), 教授 (40243977)
• Co-Investigator(Kenkyū-buntansha): SUNAGA Shoji 九州大学, 大学院芸術工学研究院, 准教授 (60294998) ; REMIJN Gerard B. 九州大学, 大学院芸術工学研究院, 准教授 (40467098)
• Project Period (FY): 2011-04-01 – 2015-03-31
• Keywords: 視覚 / 知覚 / 順応 / 残効 / 残像 / 運動 / 眼球運動 / 錯視

Outline of Final Research Achievements

Adaptation and aftereffect in various aspects of visual perception were studied, e.g., appearance of afterimages, perceptual shape changes after adaptation, motion aftereffects of illusory motion. We have found that afterimages are not simple fatigue of photo receptors on the retina but reflections of brain activities. Perceptual shapes of afterimages are sometimes different from adapted shapes. The afterimages repeat appearing, disappearing and reappearing. We found that this is caused by mutual inhibition between basic visual elements, such as combinations of color and orientation. By measuring adaptation and aftereffect, we have revealed that illusory flow perception arising in an op art painting is determined by relative motion detection mechanisms. We also investigated learning in saccades while viewing a repeated motion sequence that caused position illusions. The results of these experiments show the effectiveness of adaptation and aftereffects to study brain activities.

Free Research Field

実験心理学