MODIFICATION OF COCHLEAR MICROPHONICS AND ACTION POTENTIALS BY KCl SOLUTION AND BY DIRECT CURRENTS

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Abstract
Complete substitution of the perilymph with normal mammalian Ringer soln. does not cause any change in the electrical responses of the cochlea to sound stimuli. An increase in KCl content in the perfusing fluid reduces cochlear microphonic and action potentials reversi-bly. Elimination of the responses of the apical turn by isotonic KCl soln. does not affect the responses of the basal turn. Complete suppression of the responses of the basal turn by KCl or direct current stimulation does not influence the cochlear microphonic of the 3d turn. The basal turn of the cochlea responds to-high, to middle and to low-frequency sounds. A direct current traversing the cochlear partition from the scala vestibuli (source) to the scala tympani (sink) enhances the cochlear responses, both cochlear microphonic and action potential. A current flowing in the opposite direction brings about depression of both responses.

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