Abstract
Auditory enhancement has been suggested as a possible mechanism underlying one's ability to understand speech in noise. Using a forward‐masking paradigm, enhancement effects were evaluated in two groups of normal‐hearing persons who differed in their ability to recognize high‐frequency words in noise. Masked thresholds for a 2000‐Hz probe were compared between a standard condition in which a four‐component harmonic complex including 2000 Hz was the masker and an enhancing condition in which a three‐component adapter not including 2000 Hz preceded the masker. One explanation for the enhancement effect involves an adaptation of suppression that results in an increase in the masker effectiveness in the 2000‐Hz region. Therefore, adaptation of suppression was also evaluated by measuring forward‐masked thresholds for a 2000‐Hz probe as a function of the duration of a suppressor tone added to a 2000‐Hz masker. Although all subjects showed some degree of enhancement, there were differences in the reduction in suppression that occurred with increased suppressor duration.
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