表情認知におけるmotion sharpening

抄録

Although a dynamic sequence is, in reality, blurred to a certain extent, the elements of the sequence look sharp when the dynamic sequence is played. This effect, known as motion sharpening, has been demonstrated empirically. We investigated effect of the motion sharpening on the recognition of facial expression. We prepared dynamic sequences of two facial expressions (happy and sad), each of which comprised 100 frames. Some frames of the 100 frames were blurred by band-pass filtering. There were four blurred ratio conditions (0–100%). By comparing the dynamic sequence to a blurred still image, twenty observers judged the perceived sharpness of the sequence. We found that the motion sharpening occurred even when all frames were blurred. Furthermore, ten of twenty observers perceived that the motion sharpening for sad faces is stronger than that for happy faces under the 50% and 75% blurred ratio conditions. The results suggest that motion sharpening in dynamic sequences of facial expression differs from that of scene or geometric graphics, and that the motion sharpening depends on the facial expression image.