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Human central auditory plasticity associated with tone sequence learning.

Julie Marie Gottselig1, Daniel Brandeis, Gilberte Hofer-Tinguely

  • 1Institute of Pharmacology and Toxicology and Institute of Child and Adolescent Psychiatry, University of Zürich, CH-8057 Zürich, Switzerland. jmgottselig@pharma.unizh.ch

Learning & Memory (Cold Spring Harbor, N.Y.)
|April 1, 2004
PubMed
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Practicing auditory discrimination enhances the mismatch negativity (MMN) response, particularly for easier tasks. This neurophysiological change in the auditory system demonstrates rapid learning-related plasticity.

Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Cognitive Neuroscience

Background:

  • Mismatch negativity (MMN) is a neurophysiological response linked to auditory discrimination.
  • Auditory plasticity refers to changes in the central auditory system due to experience.
  • Understanding learning-related changes in MMN can reveal mechanisms of auditory skill acquisition.

Purpose of the Study:

  • To investigate how learning affects the amplitude, scalp topography, and source localization of the MMN.
  • To examine the relationship between auditory discrimination difficulty and learning-induced MMN changes.
  • To explore hemispheric involvement in auditory sequence learning.

Main Methods:

  • Electroencephalography (EEG) recordings were used to measure MMN in 32 participants.

Related Experiment Videos

  • Participants underwent two EEG sessions, with a brief auditory discrimination training task in between.
  • Stimuli included standard and two deviant (high and low difficulty) eight-tone sequences.

    • Main Results:

    • The amplitude of the low-difficulty (LD) MMN significantly increased after training, while the high-difficulty (HD) MMN did not.
    • Learning and changes in LD MMN amplitude were strongly correlated.
    • Source localization revealed increased activity in the left superior temporal region for LD stimuli, with right-sided sources strengthening post-learning.

    Conclusions:

    • Tone sequence learning rapidly induces neurophysiological plasticity in the human auditory system.
    • Discrimination difficulty influences the time course and magnitude of learning-related MMN changes.
    • Auditory sequence learning involves asymmetric hemispheric engagement.