title: Perception of apparent motion in depth: a high-density electrical mapping study in humans.
abstract: We evaluated brain activity using 64-channel visual evoked potentials (VEPs) while subjects perceived apparent motion in depth. Checkerboard patterns (CBPs) within small and large circles were presented in turn as experimental conditions. Motion in depth was perceived when the CBP in the large circle was coarser than in the small circle; when coarseness did not change, no motion in depth was perceived. As control conditions only fine or coarse CBPs were presented. We used ANOVA to compare VEPs associated with experimental vs. control conditions and with coarse vs. fine CBPs. Negative potentials at a latency near 190 ms showed statistically significant interactions between these comparisons in the right lateral occipital and posterior parietal areas when apparent motion in depth was perceived. This suggests that higher tiers of the dorsal stream mediate this motion perception.
authors.affiliation: Department of Psychiatry, National Defense Medical College, 3-2, Namiki, Tokorozawa, Saitama 3598513, Japan.
authors.forename: Yuji
authors.initials: Y
authors.lastname: Kobayashi
authors.forename: Aihide
authors.initials: A
authors.lastname: Yoshino
authors.forename: Masaru
authors.initials: M
authors.lastname: Kawamoto
authors.forename: Yoshitomo
authors.initials: Y
authors.lastname: Takahashi
authors.forename: Soichiro
authors.initials: S
authors.lastname: Nomura
mesh_terms: D000328:Adult; D001931:Brain Mapping; D003867:Depth Perception / Q000502:physiology*; D004569:Electroencephalography; D005074:Evoked Potentials, Visual / Q000502:physiology; D006801:Humans; D007088:Illusions / Q000502:physiology*; D008297:Male; D009039:Motion Perception / Q000502:physiology*; D009778:Occipital Lobe / Q000033:anatomy & histology / Q000502:physiology; D010296:Parietal Lobe / Q000033:anatomy & histology / Q000502:physiology; D010775:Photic Stimulation; D011930:Reaction Time / Q000502:physiology; D014793:Visual Cortex / Q000033:anatomy & histology / Q000502:physiology*; D014795:Visual Pathways / Q000033:anatomy & histology / Q000502:physiology*