Figure 2. Auditory brain stem response (ABR) elicited at 12.5 kHz in a toluene exposed rat (2000 ppm 6 h/d for 10 days) 12 days after ending of the exposure. Lower trace is ABR in response to a stimulus tone of 100 dB SPL. The next trace (going upward) is elicited at 95 dB SPL and so forth. Sensitivity on the ordinate is 5 V per division. Arrow indicates the auditory threshold (65 dB SPL) assessed.