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Articles, Behavioral/Cognitive

Plasticity in Developing Brain: Active Auditory Exposure Impacts Prelinguistic Acoustic Mapping

April A. Benasich, Naseem A. Choudhury, Teresa Realpe-Bonilla and Cynthia P. Roesler
Journal of Neuroscience 1 October 2014, 34 (40) 13349-13363; DOI: https://doi.org/10.1523/JNEUROSCI.0972-14.2014
April A. Benasich
1Center for Molecular and Behavioral Neuroscience, Rutgers, The State University of New Jersey–Newark, Newark, New Jersey 07102, and
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Naseem A. Choudhury
1Center for Molecular and Behavioral Neuroscience, Rutgers, The State University of New Jersey–Newark, Newark, New Jersey 07102, and
2Department of Psychology, School of Social Science and Human Services, Ramapo College of New Jersey, Mahwah, New Jersey 07430
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Teresa Realpe-Bonilla
1Center for Molecular and Behavioral Neuroscience, Rutgers, The State University of New Jersey–Newark, Newark, New Jersey 07102, and
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Cynthia P. Roesler
1Center for Molecular and Behavioral Neuroscience, Rutgers, The State University of New Jersey–Newark, Newark, New Jersey 07102, and
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Abstract

A major task across infancy is the creation and tuning of the acoustic maps that allow efficient native language processing. This process crucially depends on ongoing neural plasticity and keen sensitivity to environmental cues. Development of sensory mapping has been widely studied in animal models, demonstrating that cortical representations of the sensory environment are continuously modified by experience. One critical period for optimizing human language mapping is early in the first year; however, the neural processes involved and the influence of passive compared with active experience are as yet incompletely understood. Here we demonstrate that, while both active and passive acoustic experience from 4 to 7 months of age, using temporally modulated nonspeech stimuli, impacts acoustic mapping, active experience confers a significant advantage. Using event-related potentials (ERPs), we show that active experience increases perceptual vigilance/attention to environmental acoustic stimuli (e.g., larger and faster P2 peaks) when compared with passive experience or maturation alone. Faster latencies are also seen for the change discrimination peak (N2*) that has been shown to be a robust infant predictor of later language through age 4 years. Sharpening is evident for both trained and untrained stimuli over and above that seen for maturation alone. Effects were also seen on ERP morphology for the active experience group with development of more complex waveforms more often seen in typically developing 12- to 24-month-old children. The promise of selectively “fine-tuning” acoustic mapping as it emerges has far-reaching implications for the amelioration and/or prevention of developmental language disorders.

  • acoustic mapping
  • developmental plasticity
  • EEG/ERP
  • human infant
  • prelinguistic
  • training
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The Journal of Neuroscience: 34 (40)
Journal of Neuroscience
Vol. 34, Issue 40
1 Oct 2014
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Plasticity in Developing Brain: Active Auditory Exposure Impacts Prelinguistic Acoustic Mapping
April A. Benasich, Naseem A. Choudhury, Teresa Realpe-Bonilla, Cynthia P. Roesler
Journal of Neuroscience 1 October 2014, 34 (40) 13349-13363; DOI: 10.1523/JNEUROSCI.0972-14.2014

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Plasticity in Developing Brain: Active Auditory Exposure Impacts Prelinguistic Acoustic Mapping
April A. Benasich, Naseem A. Choudhury, Teresa Realpe-Bonilla, Cynthia P. Roesler
Journal of Neuroscience 1 October 2014, 34 (40) 13349-13363; DOI: 10.1523/JNEUROSCI.0972-14.2014
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Keywords

  • acoustic mapping
  • developmental plasticity
  • EEG/ERP
  • human infant
  • prelinguistic
  • training

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