. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. 250 500 1000 2000 FREQUENCY HUMAN. GUlNtA-PlG Fig. 158. Upper: Curve of intensity of stimulation necessary to elicit a just-measurable microphonic response from a cochlea which has sustained an injury. Lower: Map of the cochlea of the guinea pig, indicating localization of pitch reception. This map is recon- structed from data of 20 experiments similar to that shown above, together with histo- logical examination of basilar membrane damage. The pitch localization map for man is deduced from the guinea pig data.
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. 250 500 1000 2000 FREQUENCY HUMAN. GUlNtA-PlG Fig. 158. Upper: Curve of intensity of stimulation necessary to elicit a just-measurable microphonic response from a cochlea which has sustained an injury. Lower: Map of the cochlea of the guinea pig, indicating localization of pitch reception. This map is recon- structed from data of 20 experiments similar to that shown above, together with histo- logical examination of basilar membrane damage. The pitch localization map for man is deduced from the guinea pig data. (After Stevens, Davis and Lurie*" from ;) than if it passes near the apex. Since the natural frequency of a vibrating system increases with reductions in mass, the natural frequency of the path through the basal region is higher than that through a region near the apex. In general, there seems to be no reason for doubting the place theory of the hearing mechanism. Transmission in the Nervous System. If we assume that each cross row of hair cells (, each such row usually consisting of one inner and three outer hair cells), because of the geometry and physical character of its sur- roundings, is most sensitive to one frequency, then the next step in an ex- planation of the hearing mechanism is to show how information concerning stimulation of these cells is transmitted to the brain. Ihcre are about 3500 hair cells on the inner row and about 20,000 equally distributed among the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Prosser, C. Ladd (Clifford Ladd), 1907-; Bishop, David W. Philadelphia, Saunders
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