Abstract
The forward‐masking paradigm is used extensively in the determination of psychophysical tuning curves (PTC). PTCs are, in turn, used as indicators of auditory frequency selectivity. Our previous work on post‐noise exposure determinations of frequency selectivity using PTCs indicate that there may be temporary, frequency‐dependent changes in forward masking effects just after exposure to noise. The current study was designed to determine the nature of post‐noise exposure effects on the time course of forward masking as well as the forward masking function. Forward masking functions were obtained 2, 4, 8, and 16 min after listeners were exposed to an octave band of noise (1200–2400 Hz) at 100 dB SPL for 5 min. For control conditions, the 5‐min exposure was reduced in level to 40 dB. Masker and probe signals were tones of 300‐ and 20‐ms duration, respectively. Their frequency was 3000 Hz. Delta t, measured from masker offset to probe onset, varied from 10–100 ms. Results indicate that some of the variability observed in post‐noise PTCs may be related to changes in forward masking effects. [Work supported by funds from the University of Kansas General Research Fund.]
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