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Speech-evoked cortical potentials in children

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  • 1Department of Communication Sciences, Northwestern University, Evanston, Illinois 60208.

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|July 1, 1993
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Summary
This summary is machine-generated.

Event-related potentials (ERPs) show that the mismatch negativity (MMN) develops early in children, unlike other auditory cortical potentials. This suggests MMN can assess central auditory function in school-aged children.

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Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Auditory Neuroscience

Background:

  • Event-related potentials (ERPs) are crucial for understanding auditory processing development.
  • Previous research indicates maturational differences in auditory ERPs between children and adults.
  • The mismatch negativity (MMN) is a sensitive index of auditory discrimination.

Purpose of the Study:

  • To compare event-related potentials (ERPs) to synthesized speech stimuli in school-aged children and adults.
  • To investigate the developmental trajectory of auditory processing, focusing on early cortical potentials and the mismatch negativity (MMN).
  • To explore the potential of MMN as a measure of central auditory function in children.

Main Methods:

  • Obtained ERPs in 16 school-aged children (7-11 years) and 10 adults using synthesized speech stimuli.
  • Elicited P1, N1, and P2 potentials with the phoneme /ga/.
  • Elicited MMN with deviant /da/ and /ga/ stimuli differing in formant transition onset frequency.

Main Results:

  • Children exhibited longer peak latencies for P1 and N1, and smaller P2 amplitude compared to adults.
  • The N1/P2 complex was less defined in children than in adults.
  • MMN was well-defined in all subjects, with significantly larger magnitude in children, and no significant differences in latency or duration compared to adults.
  • A robust negative wave at 400 msec was observed in children, larger than in adults.

Conclusions:

  • Auditory ERP development is not strictly hierarchical regarding latency; earlier waves do not necessarily mature before later ones.
  • MMN shows early development and robustness in school-aged children, reflecting acoustic processing.
  • MMN's characteristics suggest its utility for assessing central auditory function in children.