Fig. 3.

The noise band used in the present study produces a reproducible pattern of permanent threshold shift in mice exposed without previous heat stress (A); hair cell loss is restricted to the extreme base (B). CAP threshold curves are shown in A for 10 Trauma Only animals compared with the mean CAP threshold curve for 10 control animals not exposed to the traumatic noise band.B shows the cytocochleogram for one of theTrauma Only cases, i.e., a plot of the percentage of hair cells remaining as a function of cochlear location. Cochlear location is translated into frequency using published data on the map for mouse (Ehret, 1983).