Vestibular Cortical Area in the Periarcuate Cortex

: Vestibular input to the periarcuate cortex in the Japanese monkey was examined by analyzing laminar field potentials evoked by electrical stimulation of the vestibular nerve. Vestibular‐evoked potentials consisted of early‐positive and late‐negative potentials and early‐negative and late‐positive potentials in the superficial and deep layers of the cortex, respectively. They were distributed bilaterally in the periarcuate cortex around the junction of the spur and the arcuate sulcus. This vestibular‐projecting area corresponded to the periarcuate area where retrogradely‐labeled corticovestibular neurons were distributed after the injection of a tracer into the vestibular nuclei. Comparison of the vestibular‐projection area with the distribution of smooth pursuit‐related neurons in the same monkey revealed that such neurons existed in the vestibular‐projecting area of the periarcuate cortex.