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Infant Auditory Processing and Event-related Brain Oscillations
Published on: July 1, 2015
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Development of subcortical speech representation in human infants
Samira Anderson1, Alexandra Parbery-Clark2, Travis White-Schwoch3
1Department of Hearing and Speech Sciences, University of Maryland, College Park, Maryland 20742, USA.
The Journal of the Acoustical Society of America
|June 22, 2015
Summary
Infant auditory development shows early fundamental frequency (F0) representation in the frequency following response (FFR). Harmonics and temporal aspects of the FFR mature with age, reflecting neural development and speech exposure.
Area of Science:
- Auditory Neuroscience
- Developmental Psychology
- Speech Perception
Background:
- Previous research focused on fundamental frequency (F0) in infant frequency following response (FFR).
- Developmental changes in FFR timing and harmonics remain underexplored in early infancy.
Purpose of the Study:
- To investigate the developmental trajectory of FFR timing and harmonic representation in infants.
- To correlate FFR development with known neurophysiological maturation processes.
Main Methods:
- Recorded frequency following responses (FFRs) to speech syllables in 28 infants aged 3-10 months.
- Analyzed F0 amplitude, harmonic amplitudes, and temporal features (onset, offset, inter-peak latencies) of the FFR.
Main Results:
- Fundamental frequency (F0) amplitude was present in some 3-month-olds, but variable.
- Harmonic amplitudes systematically increased with infant age.
- Temporal aspects, including onset, offset, and inter-peak latencies, decreased with age.
Conclusions:
- Early FFR development shows distinct maturation patterns for frequency and timing components.
- Findings support theories of early low-frequency processing and age-related myelination.
- Improvements in temporal precision correlate with neural efficiency and early speech exposure.
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