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Infant Auditory Processing and Event-related Brain Oscillations
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Cortical oscillations in auditory perception and speech: evidence for two temporal windows in human auditory cortex
1State Key Laboratory of Brain and Cognitive Sciences, Institute of Biophysics, Chinese Academy of Sciences Beijing, China.
Frontiers in Psychology
|June 6, 2012
Summary
The human auditory cortex processes sounds at distinct time scales, similar to speech, using low gamma and theta brain waves. This research reveals how the brain analyzes temporal information, supporting a dual temporal window mechanism.
Area of Science:
- Neuroscience
- Auditory Processing
- Cognitive Science
Background:
- Natural sounds, including speech, contain vital information across multiple timescales.
- Speech processing involves temporal modulation rates in the low gamma band (20-80 ms) and theta band (150-300 ms).
- The auditory cortex is hypothesized to use temporal integration with time constants matching these speech-relevant scales.
Purpose of the Study:
- To investigate the neural mechanisms of temporal integration in the human auditory cortex.
- To explore the existence of a dual temporal window mechanism for processing auditory information.
- To examine how the brain processes non-speech stimuli with speech-relevant temporal structures.
Main Methods:
- Magnetoencephalography (MEG) was used to record brain responses.
- Participants listened to non-speech auditory stimuli with varied segment durations.
- Stimuli temporal structures were designed to match or not match speech-relevant timescales (approx. 25 ms and 200 ms).
Main Results:
- Non-speech stimuli with temporal structures matching speech-relevant scales (approx. 25 ms and 200 ms) elicited reliable phase tracking in the low gamma and theta bands, respectively.
- Stimuli with non-matching temporal structures did not elicit reliable phase tracking.
- Theta band phase tracking showed rightward lateralization, while gamma band phase tracking occurred bilaterally.
Conclusions:
- The findings support the hypothesis of multi-time resolution processing in the auditory cortex on discontinuous scales.
- Evidence is provided for an asymmetric organization of temporal analysis, termed asymmetrical sampling in time (AST).
- The results suggest a neural mechanism involving the sliding and resetting of intrinsic temporal windows on privileged timescales.
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