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Updated: May 16, 2025
Through repeated performance the muscles, or rather the motor-nerve centers, become habituated to complex activities. Coördinations gradually become perfect and automatic because the nerve impulses naturally tend to take the well-worn paths. To this rule the voice is no exception. Practice makes perfect, with the voice, as with every other muscular activity.
Thus in the advance of annelids to insects the muscular system increases in relative bulk, and absolutely in complexity. But a change or increase in the muscle must be accompanied by corresponding changes in the motor-nerve fibrils; and these again would be useless unless accompanied by increased complexity and more or less readjustment of the cells and fibrils of the nerve-centres.
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