. Echoes of bats and men. Sound-waves; Echolocation (Physiology); Orientation. SUPPOSE YOU WERE BLIND tinguish between a sound source that is straight ahead and one that is displaced only 10° to one side. If the source is 3 meters away, the 10° displacement which is clearly noticeable involves a difference in time of arrival at our two ears of about millisecond. It is difficult. Fig. 15. Your ability to discriminate minute differ- ences in the time of arrival of two sounds can be tested with this device. Any source of sharp clicks will do if it is tightly enclosed in the box so that you he
. Echoes of bats and men. Sound-waves; Echolocation (Physiology); Orientation. SUPPOSE YOU WERE BLIND tinguish between a sound source that is straight ahead and one that is displaced only 10° to one side. If the source is 3 meters away, the 10° displacement which is clearly noticeable involves a difference in time of arrival at our two ears of about millisecond. It is difficult. Fig. 15. Your ability to discriminate minute differ- ences in the time of arrival of two sounds can be tested with this device. Any source of sharp clicks will do if it is tightly enclosed in the box so that you hear it only through the tubes. to locate sound sources accurately if they he directly in front of us, or anywhere in the plane that is equidistant from the two ears. If we have to attempt this, we usually do so by moving our heads about and bringing one ear closer to the source. The role of differences in time of arrival of a click at 141. 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 Griffin, Donald R. (Donald Redfield), 1915-. Garden City, N. Y. : Anchor Books
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