Wever, Ernest G. Department of Psychology, Princeton University, Princeton, New Jersey.
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The perception of sound by animals through specialized sense organs. A sense of hearing is possessed by animals belonging to two divisions of the animal kingdom: the vertebrates, which form the main subphylum of the phylum Chordata, and the insects, which make up the most important class of the phylum Arthropoda. The sense is mediated by the ear, a specialized organ for the reception of vibratory stimuli. Such an organ is found in all except the most primitive vertebrates, but only in some of the many species of insects. The vertebrate and insect types of ear differ in evolutionary origin and in their modes of operation, but both have attained high levels of performance in the reception and discrimination of sounds. See also: Sound
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