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[The preliminary study of cross-hearing and its effects of checked ear in cat].

AIM
To study the cross-hearing and its mechanism of cat, so that preliminary explore the effects to checked ear on the amplitudes of ABR.


METHODS
with the method utterly damaged the cochlea. We observed the cross-hearing and its effects on checked ear of the 16 normal cats.


RESULTS
(1) The cross-hearing began to appear when the intensity of click > or = 75 dB( SPL), if the intensity of click was increased to 95 dB, the cross-hearing become the most obvious. (2) This cross-hearing could be completely masked by 40 or 45 dB (SPL) steady white noise (SWN). (3) Make a comparison of two waves on the same time shaft indicates that the trough of cross-hearing wave and the crest of p(III), p(IV) wave by 95 dB click are corresponding. (4) To observe the alteration of amplitude of ABR evoked by 95 dB click when load 40 dB SWN on the contralateral ear under the circumstance of the both ears are normal, we discovered that the 40 dB SWN can increase the amplitude of the wave p(III), p(IV) (P < 0.01).


CONCLUSION
The experiment results demonstrate that the effect of cross-hearing to the amplitude of ABR on the checked ear depend on the corresponding situation of the wave crest and trough of both cross-hearing and ABR on the same time shaft. In fact, the ABR evoked by high intensity of click is a synthetic potential by cross-hearing and appeared on the stimulated ear.