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Infant Auditory Processing and Event-related Brain Oscillations
Published on: July 1, 2015
Distorting temporal fine structure by phase shifting and its effects on speech intelligibility and neural phase
Yingyue Xu1, Maxin Chen2, Petrina LaFaire1
1Northwestern University, Department of Otolaryngology, 320 E. Superior Street, Searle 12-561, Chicago, IL, 60611, USA.
Scientific Reports
|October 19, 2017
Summary
Periodic cues in temporal fine structure (TFS) are crucial for speech intelligibility in quiet and noise. Auditory neurons encode these TFS cues via phase locking, essential for speech perception.
Area of Science:
- Neuroscience
- Auditory Perception
- Acoustic Signal Processing
Background:
- Temporal fine structure (TFS) and envelope are key acoustic signal features.
- Understanding neural processing of TFS is vital for speech perception research.
Purpose of the Study:
- Investigate the role of TFS in speech intelligibility and neural coding.
- Examine how modifying TFS affects speech recognition and neural responses.
Main Methods:
- Modified natural speech sentences by altering phase while preserving magnitude.
- Tested speech intelligibility in normal-hearing listeners under quiet and noisy conditions.
- Recorded neural activity in guinea pig inferior colliculus using modified sentences.
Main Results:
- Speech intelligibility depended on periodic cues of TFS in both quiet and noisy environments.
- Auditory neurons showed phase locking to periodic TFS cues.
- Phase locking patterns disappeared when reconstructed sounds lacked periodic patterns.
Conclusions:
- Periodic cues of TFS are essential for speech intelligibility.
- Auditory neurons encode TFS periodic cues through phase locking.
- TFS plays a critical role in the neural basis of speech perception.
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