Frequency Sensitivity of Single Cells in the Isolated Ear

The sensory responses of single receptor cells in the isolated ear of the locust Schistocerca gregaria were measured under controlled acoustical conditions. The four anatomical groups (Fig. 1) differ as to frequency sensitivity (Fig. 11). Although the isolated ear differs much from the intact ear, it may be concluded that fairly accurate information about sound frequency reaches the CNS. The responses of most units showed a maximum sensitivity at two (Figs. 4 and 9) or three (Fig. 8) different frequencies. But several units had only one maximum (Figs. 6 and 7, right).