Visual-Vestibular and Visuovisual Cortical Interaction
PET and fMRI studies have revealed that excitation of the vestibular system by caloric or galvanic stimulation not only activates the parietoinsular vestibular cortex but also bilaterally deactivates the occipital visual cortex. Likewise, visual motion stimulation not only activates the visual cortex but also deactivates the parietoinsular vestibular cortex. These findings are functionally consistent with the hypothesis of an inhibitory reciprocal visual-vestibular interaction for spatial orientation and motion perception. Transcallosal visuovisual interaction between the two hemispheres was found by using half-field visual motion stimulation
pet fmri vestibular system spatial orientation motion perception visual system intrasensory interactions sensory input