The changes in “threshold” and maximum responses for cochlear microphonic potentials and whole‐nerve action potentials were measured following acoustic trauma with 500‐cps tones. The cochlear‐microphonic responses were measured locally in the first turn of the cochlea for 500‐, 2000‐, and 8000‐cps test tones and locally in the third turn for a 500 cps test tone. The whole‐nerve action potentials were measured in response to 500‐ and 5000‐cps tone pips. Injury to the organ of Corti in the first and third turns was rated after examination of histological sections of the temporal bones. The physiological measurements, the injury ratings, and the sound pressures and durations of the traumatic exposures were examined together for correlations and analyzed for common factors. The results served primarily to confirm previous conclusions. For durations of exposure from 5 to 80 min, equal total acoustic energy in the exposure produced equal changes in the electrophysiological responses. The ratings of anatomical injury in the cochlea departed significantly from this relation and tended to depend more strongly on sound pressure than on duration of exposure. The “threshold” shifts for CM responses from the first turn were the same for the three test frequencies, but loss of maximum potential was significantly different for the three test frequencies. The factor analysis grouped the whole‐nerve AP responses to 500‐cps tone pips with the CM responses from the first turn instead of with the CM responses from the third turn.