Border-Ownership決定に関する初期視覚野への注意が果たす役割

摘要

初期視覚野への注意が、図方向知覚に重要な役割を果たすborder-ownership 選択性細胞の反応変調に果たす役割を検証した。生理学的に忠実な計算モデルを構築し、図方向があいまいな図形を用いた心理物理実験と比較した。モデルは、心理物理実験で確認されたヒトの図方向知覚への注意の影響を定量的に良く再現した。これらの結果は、園地分離や形状知覚に、初期視覚野への注意が重要な役割を果たすことを示唆する。%Attentional modulation in early vision might affect the determination of border-ownership (BO) that indicates the direction of figure with respect to the border. The purpose of my study is to investigate the role of spatial attention applied to early vision on the determination of BO through psychophysical experiments and computational model. The model showed good agreement with psychophysical experiments in the magnitude of attentional modulation including the determination of BO for ambiguous figures which consists of the combination of pseudo white-noise stimuli. These results indicate that the activities of model BO-selective cells could be modulated significantly by spatial attention that alters local contrast gain in V1, which may account in part for automatic, bi-stable perception in ambiguous figures.