. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 220 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY Vol. 124 (Fig-. 7). The heart rate did not change from control values. In the last experiment the intensity of the sound was increased from 90 dh to 07 dl>. Although one animal awoke 30 minutes after the noise began (respirations 18/minute), it is impossible to know whether this awakening was spontaneous or not. This animal had been hibernating an unusually long time. The other two animals were undisturbed by the noise. The conclusion is that these ground squirrels are se
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 220 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY Vol. 124 (Fig-. 7). The heart rate did not change from control values. In the last experiment the intensity of the sound was increased from 90 dh to 07 dl>. Although one animal awoke 30 minutes after the noise began (respirations 18/minute), it is impossible to know whether this awakening was spontaneous or not. This animal had been hibernating an unusually long time. The other two animals were undisturbed by the noise. The conclusion is that these ground squirrels are seldom, if ever, awakened from "WHITE NOISE" applied: db^90 Cycle = 2 -2 sec off 4 > 22 21 - 20 19- 18 J 17- 16 •Heart Rate 3/mm .-'1 I. Heart Rate 4/mm -fyWyVHvyWW- i—AMWh 4 5 6 12 6 7 8 9 10 II 12 I Midnight Noon • -Mean of 3 readings o -Mean of 2 readings -1 1 1 r- -fWWW—• 6 7 8 9 10 II 12 6 7 Midnight Fig. 7. .Study of hibernating ground squirrel exposed to light and "white ; The heart rate during the application of noise stayed within control values. Later, over 24 hours, the heat gradually became slower. There was no evidence of any effect of noise upon the hibernating animal. hibernation by noise. It could hardly be a factor in influencing the observed regular awakening from hibernation. Experiments on variation in depth of hibernation. Heart rates on the ground squirrel which showed deep hibernation were re- peatedly measured over 24-hour periods I 1958 series). There was slight evidence of any change in heart rate during day and night (Fig. 8). Few measurements could be obtained on the light-hibernators since they usually awakened when electrodes were attached to the chronically implanted surgical clips. When measurements were made on these animals, hibernating heart. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these
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