Motion Processing in the Ventral Visual Pathway
The traditional view in vision research holds that motion information is processed along the dorsal visual pathway, while the ventral pathway primarily handles color and form perception. Using intrinsic signal optical imaging, the laboratory of Haidong Lu discovered for the first time that motion-selective functional domains exist in the ventral pathway. These domains are distributed within area V4, exhibit selectivity to different directions of visual motion stimuli, and partially overlap with orientation and color-selective regions.
Based on these direction-selective functional maps, they further investigated neuronal activity within these functional columns using single-unit recordings. The results confirmed the clustering of direction-selective neurons and their columnar organization. This study provides the first evidence of motion-responsive functional architecture in the ventral pathway. The findings suggest that the dorsal and ventral pathways are better defined by their computational goals rather than a strict segregation based on stimulus attributes (Li et al., 2013).
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