Spatiotemporal attribution of visual size
This study examined spatiotemporal feature attribution for visual size of objects. A small or large prime disk, a test disk of variable sizes, and a probe disk of a fixed size were sequentially presented at the same position for durations of 16.7 ms with inter-stimulus intervals of 117 ms. Observers compared visual size of the test with the probe disk. The size of test disk was underestimated and overestimated when the test followed small and large disks, respectively (Experiment 1). The modulations of visual size occurred even when each of disks was sequentially presented so as to invoke apparent motion (Experiment 2). Furthermore, when two streams of apparent motion consisting of the three types of disks were diagonally overlapped, modulation of visual size occurred in accordance with the size of attended prime disk (Experiment 3). Retinotopic and non-retinotopic feature attribution mediated by attentional tracking were manifested for visual size.