2023年12月15日　　Friday Lunch Seminar （英語で開催します）
12:15 〜 13:00
CiNet棟大会議室にて開催

演題：Role of luminance contrast on perceived depth from disparity

情報通信研究機構（NICT）
未来ICT研究所
脳情報通信融合研究センター
脳機能解析研究室
研究員　Pei-Yin Chen

担当PI : 和田 充史

Abstract:
In stereo perception, the visual system combines a pair of horizontally shifted images in the two eyes to generate a 3D percept. The difference in the horizontal location of the images seen by the left and the right eyes is called binocular disparity and is defined only by the geometry of a scene. Thus, the perceived depth from disparity is generally considered to be independent from luminance contrast. However, our psychophysical measurements show that luminance contrast does affect stereo perception. Such an effect cannot be explained by the existing disparity energy models because they predict no effect of luminance contrast on depth perception. Instead, we developed a model for disparity processing that incorporates contrast normalization of the neural response into the disparity energy model followed by the disparity averaging operation to account for the contrast dependence of perceived depth from disparity. Our follow-up fMRI experiment also shows disparity-modulated contrast response functions in disparity-sensitive areas (V3A, V3B, and KO), which may relate to the luminance contrast effect on perceived depth from disparity.