title: Position shifts of fMRI-based population receptive fields in human visual cortex induced by Ponzo illusion.
abstract: Ponzo illusion is a well-known perceptual phenomenon in which the perceived sizes of visual objects are altered by visual depth cues created by converging lines at the horizon. One possible neural mechanism of the Ponzo illusion is the receptive field position shifts of V1 neurons, as supported by a recent monkey electrophysiological study (Ni et al. in Curr Biol 24(14):1653-1658, 2014). Here, we used fMRI-based population receptive field (pRF) mapping technique in combination of psychophysics to investigate this idea. We found that, relative to the close apparent depth in a 3D scene, the far apparent depth in the scene caused the pRF positions of voxels in V1-V3 to shift toward the fovea, in line with subjects' percept of the Ponzo illusion. Moreover, the pRF position shift in V1 significantly correlated with the magnitude of the Ponzo illusion across individual subjects. Our findings thus provide evidence for the close association between the perceived object size and the pRF position shift in human visual areas, especially in V1, lending further support for the receptive field position shift explanation for the Ponzo illusion.
authors: Department of Psychology and Beijing Key Laboratory of Behavior and Mental Health, Peking University, Beijing, People's Republic of China.|Key Laboratory of Machine Perception (Ministry of Education), Peking University, Beijing, People's Republic of China.|Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, People's Republic of China.|PKU-IDG/McGovern Institute for Brain Research, Peking University, Beijing, People's Republic of China.
authors: Dongjun
authors: D
authors: He
authors: Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, People's Republic of China.
authors: Ce
authors: C
authors: Mo
authors: National Engineering Laboratory for Video Technology, School of Electronics Engineering and Computer Science, Peking University, Beijing, 100871, People's Republic of China.
authors: Yizhou
authors: Y
authors: Wang
authors: Department of Psychology and Beijing Key Laboratory of Behavior and Mental Health, Peking University, Beijing, People's Republic of China. ffang@pku.edu.cn.|Key Laboratory of Machine Perception (Ministry of Education), Peking University, Beijing, People's Republic of China. ffang@pku.edu.cn.|Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, People's Republic of China. ffang@pku.edu.cn.|PKU-IDG/McGovern Institute for Brain Research, Peking University, Beijing, People's Republic of China. ffang@pku.edu.cn.
authors: Fang
authors: F
authors: Fang
mesh_terms: D000293:Adolescent; D000328:Adult; D003867:Depth Perception / Q000502:physiology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009903:Optical Illusions / Q000502:physiology*; D011601:Psychophysics; D012858:Size Perception / Q000502:physiology*; D014793:Visual Cortex / Q000502:physiology*; D014794:Visual Fields / Q000502:physiology*; D055815:Young Adult
keywords: Functional brain imaging; Ponzo illusion; Population receptive field; Psychophysics