The more complex the spatial structure of images is, the longer time the visual system will spend to analyze its correspondence problem of apparent motion. I investigated the relation between the structural complexity of stimulus and the temporal property of correspondence process. In the experiments, three kind of stimulus-series (from simple to complex; a dotted pattern, an opaque pattern, and human-faces) were prepared and presented by the frame-splitting procedure (Suga & Kato, 1994, 1995) through either partial mask or random-pass filter. This procedure provides a mean of investigating experimentally the temporal limitation concerned with solving correspondence problem. In the results, to all correspondence problems under these experimental conditions, the temporal upper limitation of 100 ms were indicated. The results are discussed in terms of the visual buffer without the influence of the stimulus complexity.
