Abstract
Davis and Weiler (1975) found that significant decreases in reaction time could be measured as a function of exposure to an adapting tone. Following Davis' procedure in the present study, change in reaction time for 22 normal hearing individuals was measured with a 50-dB SPL, 400-Hz test tone and a 50-dB SPL, 500-Hz adapting tone presented for seven minutes. In counterbalanced fashion, a 500-Hz test tone with a 400-Hz adapting tone was tested to determine the possibility of contrasting effects as a function of tonotopic position of the two frequencies. A significant increase in reaction time was found using the 400-Hz test tone (p < 0.01) while no significant time increase was found using the 500-Hz test condition. The significantly increased reaction time could be partially attributed to the effects of passage of the traveling wave through the 500-Hz adapted region whereas the 500-Hz test tone does not completely overlap with the 400-Hz adapting tone. The significant increase in reaction time contrasts with Eggermont's (1979) decrease in AP latency in recruiting ears.
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