Research on Auditory Long Latency Response in Normal Hearing Subjects.

OBJECTIVES

To explore the characters and the relationship among latency response, amplitude and sound stimulus intensity of auditory long latency response（ALR）, and to investigate the significance of ALR applied in auditory threshold prediction.

METHODS

Total 46 subjects （92 ears） with normal hearing were tested by ALR. The ALR waves of the subjects were elicited by 5 sound stimulus intensity according to the order of 70, 50, 30, 20 and 10 dB nHL. By making N₁ wave and P₂ wave, the values of 3 observed indexes （the latencies of N₁ wave and P₂ wave and N₁-P₂ amplitude） were obtained, and the variation trend of the observed indexes were statistically analyzed. The differences in the frequency of the indexes were observed.

RESULTS

The rate of ALR waves from 46 subjects （92 ears） with normal hearing was 100%. The latencies of N₁ wave and P₂ wave delayed gradually and N₁-P₂ amplitude declined with sound stimulus intensity descending.

CONCLUSIONS

In suitable conditions, ALR is a stable technology for hearing thresholds prediction. The relation between sound stimulus intensity and latency of N₁ wave, latency of P₂ wave and N₁-P₂ amplitude of ALR plays an important part in auditory thresholds assessment.