視覚運動プライミング現象における空間周波数の効果

抄録

Perceived direction of a moving stimulus is affected by the direction of the preceding stimulus. In the Visual Motion Priming (VMP) phenomenon (Pinkus & Pantle, 1997, Vision Res, 37:541-52), a directionally ambiguous motion step (test stimulus) appears to be in the same direction as the preceding unambiguous motion step (prime stimulus). The purpose of the present study is to elucidate spatial frequency characteristics of this phenomenon. Using spatially superimposed sinusoidal gratings, magnitude of the priming effect was measured by varying the spatial frequencies of the test and the priming stimuli. The results show that the effect of VMP was dominant when the spatial frequency of the priming stimulus was lower than the test stimulus. These findings are discussed in terms of local motion detection systems.