The Effect of Contralateral Signal on Distortion Product Otoacoustic Emissions and Psychophysical Tuning Curves at 1 and 2 kHz |
| A. Wicher
Institute of Acoustics, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland |
| Full Text PDF |
| The main aim of this work was to determine the influence of contralateral stimulation (CS) on the psychophysical tuning curves (PTCs) and distortion product otoacoustic emissions (DPOAEs). PTCs and DPOAEs were measured in two modes: in the presence or absence of CS. The contralateral signal was a wideband noise (bandwidth 0.2-10 kHz) at a level of 50 dB sound pressure level (SPL). The primary tones (F1 and F2) were presented at levels of L1=60 dB SPL, and L2=50 dB SPL. The signal frequency used in the measurements of the PTC was 1 kHz or 2 kHz. For both PTC signal frequencies the CS significantly reduces the sharpness of the PTCs. The average change in level of DPOAE under the influence of CS throughout the whole range of frequencies takes an effect of suppression. The CS has a significant effect on decreasing the value of the quality factor (Q10Roex) of PTCs (F(1,9)= 19.36, p=0.002). The CS caused a decrease in the level of DPOAE in 88% of cases. The maximum suppression of the DPOAE level occurs for the F2 frequency from 1 kHz to 2 kHz. |
DOI: 10.12693/APhysPolA.123.1001 PACS numbers: 43.64.Jb, 43.66.Dc |