AP and SP responses were investigated by the single electrode technique.
The recording sites were the round window, mid-portion of the bony wall of cochlea, the apical portion of the cochlea and bony wall of the hypotympanum.
One cycle of sound stimuli at 8kHz, 4kHz, 1kHz and 0.5kHz was used and the sounds were given from 50cm lateral to the tested ear.
The tone bursts with duration of 30msec were used as measurement of SP.
The results obtained were as follows:
The highest value of AP out-put potential was obtained by the round window recording. The highest value of AP out-put potential was obtained by the stimulation of one cycle of 4kHz and 8kHz.
The positive SP as seen in the round window recording changed to a decreased positive SP or negative SP at the recording sites except the round window.
The SP induced by a tone burst from the round window showed the positive SP at high frequency and the negative SP at low frequency.
These results will contribute to the research on the single electrode recording of AP and SP responses in these animals.
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