The effect of a precursor on growth of forward masking |
| |
Authors: | Krull Vidya Strickland Elizabeth A |
| |
Institution: | Department of Speech, Language, and Hearing Sciences, Purdue University, West Lafayette, Indiana 47907-2038, USA. |
| |
Abstract: | This study examined the effect of an on-frequency precursor on growth-of-masking (GOM) functions measured using an off-frequency masker. The signal was a 6-ms, 4-kHz tone. A GOM function was measured using a 40-ms, 2.8-kHz tone (the off-frequency masker). GOM functions were then measured with an on-frequency, fixed level precursor presented before the off-frequency masker. The precursor was 50 or 60 dB SPL, and 160 ms in duration. For the 60-dB SPL precursor, a 40-ms duration was also used. Two-line functions were fit to the GOM data to estimate the basilar membrane input-output function. The precursors reduced the gain of the input-output function, and this decrease was graded with precursor level. Both precursor durations had the same effect on gain. Changes in masking following a precursor were larger than would be predicted by additivity of masking. The observed decrease in gain may be consistent with activation of the medial olivocochlear reflex by the precursor. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|