Affiliation:
1. Institut für Arbeitsphysiologie an der Universität Dortmund, Abteilung Sinnes- und Neurophysiologie, Ardeystrasse 67, D-44139 Dortmund, Germany
Abstract
Simulated auditory motion, ie step-ramp modulated interaural intensity (Δ I) or time (Δ t) was presented via headphones as an adapting stimulus (narrow-band signal of 1 kHz mean frequency). After adaptation, settings of a stationary test stimulus were systematically shifted in the opposite direction when the experimental parameter was Δ I, but not when it was Δ t. Further studies with Δ t motion with the use of mean frequencies of 100 Hz or 6 kHz showed an aftereffect only at 6 kHz. Unlike visual motion aftereffects, no counter-motion was observed; rather the test stimulus appeared stationary, but settings of its interaural midline were displaced in a direction opposite to the direction of adaptation (on average by 1.2 dB or 30 μs for Δ I-simulated and Δ I-simulated motion, respectively). This displacement effect decayed with time after adaptation. The frequency dependence found for Δ t motion suggests that the low-frequency mechanism of directional hearing that uses interaural ongoing-time (phase) differences is not able to adapt. The observed auditory aftereffects may be analogous to visual motion aftereffects since they are direction specific; however, because they lack apparent motion they also resemble disparity-specific stereoscopic aftereffects.
Subject
Artificial Intelligence,Sensory Systems,Experimental and Cognitive Psychology,Ophthalmology
Cited by
28 articles.
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