倒立提示によるさまざまな向きに変化した頭部の視覚的特徴情報の分析(<特集>高次視覚における認知と理解)

抄録

By using spatial frequency (SF) analysis we investigated the visual information of human heads in different views in the inverted presentation. The stimuli were inverted images of the heads of three familiar people, viewed from the frontal view to the back of the head, which were created by four band-pass filters (8, 16, 32, and 64c/fw). The results of Experiment 1 indicated that mean reaction times (RT) for both the three-quarter and profile views were linearly slower as the heads were changed from upright to inverted orientations. However, there was no significant difference in RT for the upright and inverted presentation on frontal view and the back of the head. The results of Experiment 2 showed that RT decreased for the inverted frontal and profile views when the images had high SF. RT for the back of the head was decreased in the middle range of SF. These results suggest that different view-specific information may exist in each view, even in the inverted presentation. In addition, there was also different processing for the upright and inverted orientations not only for the frontal view but also the profile view and the back of the head.