Study design: clinical prospective randomized. Material and method: at the present work it was registered answers of the growth rates at frequencies of 1,000, 2,000, 4,000 and 5,000 Hertz with sound stimulus of 45 to 70 dB SPL in beats of 5 dB per point, being the F2/F1 rate equals to 1.22. Sixteen normally hearing "perfect" people between 18 to 25 years old were evaluated. The equipment used for the test was the ILO 92 OTODYNAMIC Inc. The answers were considered present when 3 dB above the back noise was registered. Result: There was no statistics significant difference in relation to age, sex and right ear and left ear. The DPOAE occurrence was of 100% at the frequencies of 2,000, 4,000 and 5,000 Hertz and of 84.37% at the 1,000-Hertz frequency when the cochlea was stimulated at 70 dB SPL. Conclusion: The growth rates showed a linear aspect inclination without plateau, although the back noise kept itself constant, showing a slight increase from the 55-dB SPL stimulus.
hearing; otoacustic emissions; growth rates
