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Neural representation of interaural correlation in human auditory brainstem: Comparisons between temporal-fine
Qian Wang1, Hao Lu2, Zhemeng Wu2
1School of Psychological and Cognitive Sciences, Beijing Key Laboratory of Behavior and Mental Health, Peking University, Beijing, 100080, China; Beijing Key Laboratory of Epilepsy, Epilepsy Center, Department of Functional Neurosurgery, Sanbo Brain Hospital, Capital Medical University, Beijing, 100093, China.
Hearing Research
|June 2, 2018
Summary
The human auditory brainstem more precisely represents temporal-fine structure (TFS) than envelope information for sound processing. This study reveals brainstem mechanisms for integrating TFS and envelope signals, crucial for auditory perception.
Area of Science:
- Auditory Neuroscience
- Neuroscience
- Signal Processing
Background:
- Interaural correlation (IAC) processing is vital for sound localization and recognition.
- Complex sound waves decompose into temporal-fine structure (TFS) and envelope components.
- Frequency-following responses (FFRs) in rats show distinct TFS (FFRTFS) and envelope (FFREnv) components sensitive to interaural time disparity.
Purpose of the Study:
- Investigate differential sensitivity of human brainstem FFRTFS and FFREnv to IAC shifts.
- Explore potential brainstem mechanisms for integrating TFS and envelope components.
Main Methods:
- Recorded human brainstem FFRs to narrowband noise with varying IAC.
- Analyzed FFRTFS and FFREnv amplitudes and stimulus-to-response correlations.
- Assessed correlations between FFRTFS and FFREnv changes due to IAC shifts.
Main Results:
- Both FFRTFS and FFREnv amplitudes were affected by IAC shifts.
- FFRTFS stimulus-to-response correlation, unlike FFREnv, was sensitive to IAC shifts.
- Significant correlation observed between IAC-induced changes in FFRTFS and FFREnv.
Conclusions:
- Human auditory brainstem represents TFS information more precisely than envelope information.
- Correlations between FFRTFS and FFREnv suggest a brainstem binding mechanism for perceptual integration of sound components.
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