Abstract: According to the Aperture Problem in human motion perception,when a moving grating is viewed by the subject through a small ap-erture, the only motion that could be perceived by the human visual sys-tem is the motion component orthogonal to the bars of the grating. In this paper we designed a family of windows with diffrent shapesto deal with human local motion perception. The results reveal that hu-man local motion perception, including sujective motion direction andspeed, depends on the shapes of the windows and some constraints onorientations of the grating. It is quite evident that the viewpoint of thetraditional Aperture Problem is one-sided.

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