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Memory-guided perception is shaped by dynamic two-stage theta- and alpha-mediated retrieval
Manda Fischer1,2,3, Morris Moscovitch2,3, Claude Alain2,3
1The Brain and Mind Institute, University of Western Ontario, London, Ontario, Canada.
Annals of the New York Academy of Sciences
|February 4, 2025
Summary
Memory retrieval speeds up auditory perception when sounds are predictive. Distinct brain activity patterns, particularly theta and alpha power changes, reveal a two-stage mechanism in how memory guides hearing.
Area of Science:
- Neuroscience
- Auditory Perception
- Cognitive Psychology
Background:
- Memory significantly influences perception, but research often neglects the dynamic nature of memory retrieval.
- Previous studies predominantly used static visual tasks, creating a bias in understanding memory-guided perception.
Purpose of the Study:
- To investigate the neural mechanisms underlying memory's influence on auditory perception.
- To explore the temporal dynamics of auditory associative memory retrieval.
Main Methods:
- Used electroencephalography (EEG) to monitor brain activity during a cue-target auditory paradigm.
- Participants (N=64) listened to soundscapes that were either predictive or nonpredictive of a target tone.
Main Results:
- Faster target detection occurred in predictive soundscapes, demonstrating a memory-guided perceptual benefit.
- Distinct theta and alpha power changes were observed at early (950 ms) and late (1650 ms) time points, differentiating predictive from nonpredictive contexts.
- Early theta activity in the left anterior temporal lobe correlated with the perceptual benefits.
Conclusions:
- Distinct neural processes operate at different time points during associative memory retrieval.
- A two-stage retrieval mechanism, sensitive to temporal cues, explains how memory influences auditory perception.
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