Abstract

A high level of activity in the middle ear muscles was recorded from cats during rapid eye movement sleep. In contrast, these muscles were found to be relatively inactive during slow-wave sleep. This result was obtained from records both of the EMG of the middle ear muscles, and of the contraction-induced attenuation of a steady-state acoustic signal recorded at the round window. The activity of these muscles during sleep is thus apparently similar to that of the extraocular muscles.

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