PURPOSE: to evaluate the suppression effect of the Middle Latency Response (MLR) and Long Latency Potential on normal hearing individuals. METHODS: twenty-five individuals of both genders between 18 and 30-year old were evaluated (50 ears), with presence of OAE in both ears (thus, excluding any middle ear problem or hearing loss that could compromise the final evaluation). The individuals did not present any complain on the Auditory Processing. We used MLR and P300 with and with no contralateral white noise. The latency and amplitude of the waves were evaluated (with and with no noise) and the results were compared. RESULTS: we found reduction in the median amplitude in the situation with noise (masking) in all positions (C3/A1, C4/A1, C3/A2 and C4/A2). However, these findings had no statistically significant difference in the positions C3/A1. CONCLUSION: the effect of the suppression on the amplitude could be linked to the efferent system that decreases the number of neuronal synapses.
Evoked Potencials; Audiology; Hearing Tests
