2pPP9. Reaction time adaptation: Hick's law may bias the outcome.

Session: Tuesday Afternoon, May 14

Time: 3:15

Author: T. Goldman
Author: E. M. Weiler
Author: D. E. Sandman
Author: J. M. Davis
Location: ML #379, Communication Sciences and Disorders, Univ. of Cincinnati, Cincinnati, OH 45221


Auditory adaptation is characterized by a decrease in apparent loudness over several minutes of time. This is true for magnitude estimated loudness adaptation measured either ipsilaterally [Weiler et al., Br. J. Audio. 15, 201--204 (1981)] or induced binaurally [Botte et al., J. Acoust. Soc. Am. 72, 727--739 (1982)]. The extent of ipsilateral adaptation is also a function of time of day [Sandman et al., J. Aud. Res. 22, 65--69 (1982)], as well as duration of exposure [Weiler and Cobb, J. Aud. Res. 22, 233--239 (1982)]. The dB adaptation by the classic Simultaneous Dichotic Loudness Balance procedure progresses over time [Hood, Acta Oto-Laryngol. Suppl. 92, 1--57 (1950)]. In 1976, Davis and Weiler [Br. J. Audiol. 10, 102--106] found that simple reaction time (RT) to a constant intensity, increased reliably after 7 min of exposure, as if the intensity had decreased. Goldman et al. [J. Aud. Res. 21, 13--16 (1981)] and Weiler et al. [J. Gen. Psychol. 114 (1987; errata, 1988)] confirmed this effect. However, in a modified design [T. Goldman, Ph.D. dissertation, University of Cincinnati (1985)] the reaction time increased significantly only for the second trial after 15 s of exposure. Thereafter RT values did not differ significantly from the baseline. Hick's law is offered as an explanation, as well as differences in procedure between RT adaptation studies.

from ASA 131st Meeting, Indianapolis, May 1996