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Updated: Aug 11, 2025
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A Method to Study Adaptation to Left-Right Reversed Audition
Published on: October 29, 2018
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Adaptation in the sensory cortex drives bistable switching during auditory stream segregation
Nathan C Higgins1, Alexandra N Scurry2, Fang Jiang2
1Department of Communication Sciences and Disorders, University of South Florida, 4202 E. Fowler Avenue, PCD1017, Tampa, FL 33620, USA.
Neuroscience of Consciousness
|February 8, 2023
Summary
Neural adaptation and brain activity dynamics drive perception switches. Specific brain regions show distinct activation patterns during auditory stream segregation shifts, supporting adaptation theories.
Area of Science:
- Neuroscience
- Auditory Perception
Background:
- Perception switches are theorized to involve neural adaptation, inhibitory competition, and noise.
- Neurophysiological studies identify neural signatures critical for perceptual switches.
Purpose of the Study:
- Investigate brain activity dynamics during perceptual switches using functional magnetic resonance imaging (fMRI).
- Examine brain responses to a bistable auditory stream segregation stimulus.
Main Methods:
- Utilized fMRI to monitor brain activity in participants listening to an auditory stream segregation task.
- Analyzed brain activity patterns associated with switches between integrated and segregated auditory percepts.
Main Results:
- The auditory thalamus showed increased activity during switches from segregated to integrated perception.
- Rostral anterior cingulate cortex and inferior parietal lobule activity increased during switches from integrated to segregated perception.
- Auditory cortex activity strengthened before perception switches and weakened afterward, consistent with adaptation.
Conclusions:
- Brain activity asymmetries correlate with the direction of perceptual switches in auditory stream segregation.
- Observed neural dynamics in the auditory cortex support computational models of adaptation in bistable perception.
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