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By O. Lowenstein

ISBN-10: 0120115069

ISBN-13: 9780120115068

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BROWN AND J. D. PYE of maintaining normal body temperature in such small animals when under anesthetic. Lack of temperature control profoundly affects the neural responses to higher frequencies and also affects the high-frequency CM response to some extent. It has been shown in Mus and Clethrionomys that comparatively minor body temperature reductions from the maintained level of 38°C down to 35°C decreased the high-frequency response by 15-30 dB at 50 kHz, without significantly affecting the lowfrequency response (Brown, 1971b, 1973b).

O Ul o < · ^25 UJ o cr ^Vj # —· A 7>-—L · UJ a. 120 130 140 KILOCYCLES/SECOND 150 FIG. 14. The decline of behavioral responses to stimuli of very high frequencies in a Tursiops truncatw. From Schevill and Lawrence. Reprinted with permission from J. Exp. Zool. 124, 157 (1953). 44 A. M. BROWN AND J. D. PYE ■50 ■60 ~/b1 2 3 5 8 10 15 20 30 50 80100150 Frequency, kc/sec FIG. 15. Hearing responses for two dolphin species, from T. H. Bullock et al, Z. Vergl. Physiol. 59, 130 (1968). , and the open circles show measurements made by a behavioral technique on T.

11). There is, therefore, remarkable agreement between results obtained for cochlear microphonic, inferior collicular, and behavioral responses in demonstrating the presence of a peak at 40 kHz. It would be false to give the impression that all workers have found this peak, however. Schleidt (1952), using behavioral responses, and Ishii et al. (1964), re­ cording the CM response, made no mention of such a peak, despite the use of tones up to 100 kHz, and Peacock and Williams (1962) were un­ able to train rats to respond to 40 kHz.

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