| Budget Amount *help |
¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1998: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1997: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Research Abstract |
The present research concerns the integrative process of the human visual motion processing. It is well known that in the human visual system, local motion signals are detected at the first stage of processing, and the outputs of the first stage are integrated into two-dimensional global motion signals at the second stage. But the spatio-temporal properties and the nature of the integrative process are yet to be elucidated. The present research examined experimentally the stimulus dependencies of facultative and inhibitory interactions between local motion signals, thereby amied to explore the integrative process of the human visual motion processing. In a first series of experiments, motion assimilation for expansion/contraction and its spatial properties were examined in a two-frame apparent motion display. And, in the second series, the effects of stimulus spatio-temporal properties on motion assimilation and motion contrast were examined in a two- and multi-frame apparent motion display. The main fidings obtained in the two series of experiments are
(1) facilitaive interactions exist not only between local one-dimensional motion signals, but also between local signals and global two-dimensional motion signals.
(2) relative dominance between facilitaive and inhibitory interactions varies depending on the three stimulus parameters, ie. displacement size, number of frames of the motion display, and duration of each frame.
These results will serve as critical cues to elucidate (and help to establish a model of) the integrative process of the human visual motion processing.
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