2020\u5e741\u670810\u65e5\uff08\u91d1\uff09
16:00-17:00
\u4f1a\u5834\uff1a CiNet\u30001F\u3000\u5927\u4f1a\u8b70\u5ba4<\/p>\n\n\n\n
\u8b1b\u6f14\u30bf\u30a4\u30c8\u30eb\uff1a\u201dSuboptimal visual averaging reveals compulsory, nonlinear mechanisms in human vision\u201d<\/p>\n\n\n\n
\u8b1b\u5e2b\uff1a
Takahiro Doi
Department of Psychology
University of Pennsylvania<\/p>\n\n\n\n
\u62c5\u5f53:\u00a0\u85e4\u7530 \u4e00\u90ce\u00a0(PI)<\/p>\n\n\n\n
Abstract:
How humans integrate ambiguous and conflicting signals has been a focus of perception and decision-making research for decades. Identifying the source of sub-optimality can reveal the information integration strategy used by the nervous system to solve ecologically relevant tasks in natural environments. In this study, we examined visual spatial averaging, a fundamental process underlying the transformation of noisy local signals into a more stable global estimate. A novel paradigm was used to measure the degree of human sub-optimality against the ideal observer. In this talk, first I will establish that human visual averaging is suboptimal in both luminance and stereoscopic domains: the visual system does not faithfully compute the average of a spatially varied stimulus, especially when spatial variability is large. Then, I will present a series of experiments designed to identify the source of sub-optimality. Our results indicate two kinds of nonlinear mechanisms at work: one is related to the down-weighting of outlier samples and the other is the spatial interaction among nearby signals within a stimulus. These compulsory nonlinear mechanisms, while suboptimal in our laboratory task, may reflect an information integration strategy that improves performance in more natural contexts cluttered with object boundaries and illumination variation.<\/p>\n","protected":false},"featured_media":0,"template":"","acf":[],"_links":{"self":[{"href":"http:\/\/cinetjp-static3.nict.go.jp\/japanese\/wp-json\/wp\/v2\/event\/1430"}],"collection":[{"href":"http:\/\/cinetjp-static3.nict.go.jp\/japanese\/wp-json\/wp\/v2\/event"}],"about":[{"href":"http:\/\/cinetjp-static3.nict.go.jp\/japanese\/wp-json\/wp\/v2\/types\/event"}],"wp:attachment":[{"href":"http:\/\/cinetjp-static3.nict.go.jp\/japanese\/wp-json\/wp\/v2\/media?parent=1430"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}