Human V6: The Medial Motion Area
نویسندگان
چکیده
Cortical-surface-based functional Magnetic Resonance Imaging mapping techniques and wide-field retinotopic stimulation were used to verify the presence of pattern motion sensitivity in human area V6. Area V6 is highly selective for coherently moving fields of dots, both at individual and group levels and even with a visual stimulus of standard size. This stimulus is a functional localizer for V6. The wide retinotopic stimuli used here also revealed a retinotopic map in the middle temporal cortex (area MT/V5) surrounded by several polar-angle maps that resemble the mosaic of small areas found around macaque MT/V5. Our results suggest that the MT complex (MT+) may be specialized for the analysis of motion signals, whereas area V6 may be more involved in distinguishing object and self-motion.
منابع مشابه
Motion sensitivity of human V6: A magnetoencephalography study
Recent studies suggest the presence of a human homologue of monkey V6 in the dorsal posterior bank of the parieto-occipital sulcus. Monkey V6 comprises a retinotopic representation with relative peripheral visual field emphasis and is sensitive to visual motion. We studied sensitivity to visual motion in human parieto-occipital sulcus. Our upper peripheral visual field stimulus enabled us to di...
متن کاملParallel motion signals to the medial and lateral motion areas V6 and MT +
MT+ and V6 are key motion areas of the dorsal visual stream in both macaque and human brains. In the present study, we combined electrophysiological and neuroimaging methods (including retinotopic brain mapping) to find the electrophysiological correlates of V6 and to define its temporal relationship with the activity observed in MT+. We also determined the spatio-temporal profile of the motion...
متن کاملThe functional role of the medial motion area V6
In macaque, several visual areas are devoted to analyze motion in the visual field, and V6 is one of these areas. In macaque, area V6 occupies the ventral part of the anterior bank of the parieto-occipital sulcus (POs), is retinotopically-organized and contains a point-to-point representation of the retinal surface. V6 is a motion sensitive area that largely represents the peripheral part of th...
متن کاملThe cortical visual area V6 in macaque and human brains.
Single cell recording and neuro-anatomical techniques in the monkey have allowed to find a mosaic of visual areas in the temporo-parieto-occipital cortex. Thanks to neuroimaging methods, several of these areas have been mapped also in the human brain and named in humans based on homologies in their visuotopic organization with non-human primate areas. We have recently found a new, retinotopical...
متن کاملDissociation of retinal and headcentric disparity signals in dorsal human cortex
Recent fMRI studies have shown fusion of visual motion and disparity signals for shape perception (Ban et al., 2012), and unmasking camouflaged surfaces (Rokers et al., 2009), but no such interaction is known for typical dorsal motion pathway tasks, like grasping and navigation. Here, we investigate human speed perception of forward motion and its representation in the human motion network. We ...
متن کامل