FIGURE 7. Click-evoked compound action potentials (CAPs) obtained in quiet (solid lines) and in contralateral noise (dashed lines).
(a) Contralateral noise suppressed the CAP in the left cochlea of an intact control subject by 70%. (b) Both cochleae of cat 92olf1 were incompletely lesioned and like the intact cat showed large reductions of CAP in contralateral noise, (c) The left cochlea of cat 92olq1 was successfully lesioned and shows only weak efferent suppression.