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Auditory aftereffects following simulated motion produced by varying interaural intensity or time
1Institut für Arbeitsphysiologie, Universität Dortmund, Germany.
Perception
|January 1, 1994
Summary
Auditory motion adaptation causes aftereffects in perceived sound location, particularly with intensity changes. Time-based motion aftereffects were frequency-dependent, suggesting specific mechanisms for directional hearing adaptation.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Sensory Perception
Background:
- Auditory motion perception relies on interaural time (delta t) and intensity (delta I) differences.
- Motion aftereffects (MAEs) are well-documented in vision but less understood in audition.
Purpose of the Study:
- To investigate auditory motion aftereffects using simulated step-ramp modulated interaural cues.
- To determine if auditory MAEs are direction-specific and frequency-dependent.
Main Methods:
- Headphone presentation of narrow-band auditory stimuli with modulated delta I or delta t.
- Adaptation to simulated auditory motion followed by testing of stationary stimuli.
- Systematic shifts in stationary stimulus settings to measure aftereffects.
Main Results:
- Adaptation to delta I motion induced aftereffects, shifting perceived location opposite to adaptation direction.
- Adaptation to delta t motion showed aftereffects only at 6 kHz, not 100 Hz.
- Observed aftereffects were displacements of the interaural midline, not apparent motion.
Conclusions:
- Auditory motion aftereffects exist and are direction-specific, analogous to visual MAEs.
- The frequency dependence of delta t aftereffects suggests limitations in low-frequency directional hearing adaptation.
- Auditory aftereffects resemble visual MAEs and stereoscopic aftereffects due to their direction specificity and lack of apparent motion.