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Summary:
Our research aims to examine the dynamic/adaptive nature of
human visual perception-including its cross-modal, sensory-motor,
developmental, and neurological aspects-using methods having a broad scope.
Methodologically, several techniques have been particularly successful.
(1) Microscopic psychophysics of visual perception in a very brief
time period (1-200 ms) has revealed how the visual system identifies
transient visual input in the context of a sustained, or continuously
changing, frame of reference. Our initial finding of the "flash lag
effect" in motion perception has now been generalized to other visual
attributes such as luminance, color and spatial frequency.
(2) Utilizing our new technique combining transcranial magnetic
stimulation (TMS) and psychophysics, we have isolated the exact
spatio-temporal details of the visual cortical processes which are directly
responsible for pattern and feature filling-in in the domains of both space
and time.
(3) Comparison between infants and adults in cross-modal
integration has revealed both qualitative similarities and quantitative
differences between them.
Unlike the traditional literature of cross-modal
interaction which focuses on the influence of visual stimuli on auditory
perception, our findings are unique in that they clearly show the
influence of auditory stimuli on visual information processing. As the
latest example, we found that a very brief (17-200ms) visual flash with a
single-peak luminance profile is perceived as double flash when it is
accompanied with two or more sounds.
Our projects include:
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