A computerized recording-analysis system of auditory evoked responses for laboratory animals is developed. The stimulation system is controlled using a GPIB board and a digital interface board in the slots of the personal computer PC-9801 (NEC), and the signals generated by the animal are amplified and then digitalized by an A/D converter also mounted in the computer. The following parameters are controlled on the keyboard: averaging count; sampling time; timing to start rejecting data; and wave form, frequency, phase and attenuation of stimulus sound. Study of the auditory evoked responses of experimental perilymphatic fistula guinea pigs with this system demonstrated availability and userfriendliness of the system as well as residual hearing between 10 and 14kHz in over one-third of the animals.
