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中山遼平: “Spatiotemporal continuity of vision as a product of cyclic binding of position and object at theta rhythm”

 

2017年04月21日  16:00 〜 17:30

CiNet 1F 大会議室
中山遼平

東京大学大学院総合文化研究科

担当 :天野 薫 (PI)

Abstract:

Recent evidences reveal that sensory information is processed only periodically and integrated into conscious perception across the temporal diversity of cortical representations. How does the visual system accomplish the subjectively smooth transitions across perceptual moments? To address this issue, we analyzed a novel illusion in which a single Gabor pattern is made to appear temporally discrete. This discretization depends on the difference in speed between window and grating in the head-centered coordinate, but the apparent rhythm is constant at 4-6 Hz regardless of the stimulus speed. This rhythmic percept is found to be correlated with the reduction of theta-band neural oscillatory activities over a wide region around the occipital cortex. These results suggest that theta-rhythmic periodical neural process, involved in the periodical function of attention to bind perceptual attributes and locations, underlies the continuity of visual perception.