[Auditory response at the posterior part of the first temporal convolution (author's transl)]

Among the epileptic patients investigated by the stereotactic E. E. G. (Talairach) whose electrodes were introduced at or around the auditory cortex (Area 41, 42), the topography of the auditory responses by the electrical bipolar stimulation and that of the auditory evoked potential by the bilateral click sound stimulation were studied in relation to the ac--pc line (Talairach). The positive points of auditory responses and those of evoked potential were found in the posterior part of the first temporal convolution at or around the Hesch's transverse gyrus. The contralateral auditory responses to the stimulating electrodes situated more anterior and superior than the homolateral responses in lateral projection and more medial in frontal projection. The points of the sensation of "elevation" or "fall" elicited by the electrical stimulation which were thought to be related to the vestibular function were scattered more superior and posterior than the points of the auditory responses in lateral projection and more medial in frontal projection. This study gave the accurate topography concerning the auditory responses, the positive auditory evoked potentials and the vestibular function related sensation (sensation of "elevation" or "fall"). Further study will be required to elucidate the functional anatomy of the human auditory cortex.