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Auditory detection learning is accompanied by plasticity in the auditory evoked potential.

Matthew G Wisniewski1, Natalie J Ball2, Alexandria C Zakrzewski1

  • 1Kansas State University, Manhattan, KS 66503, United States.

Neuroscience Letters
|February 1, 2020
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Summary

Practice improves auditory detection, with training enhancing sound perception. This study suggests long-term neural changes, not just attention, underlie these auditory learning effects.

Keywords:
EEGERPP2Perceptual learningProbe-signal

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Psychoacoustics

Background:

  • Auditory detection performance often improves with practice.
  • These improvements are typically attributed to selective attention.
  • However, long-term neural plasticity resulting from training may also contribute.

Purpose of the Study:

  • To investigate the role of long-term neural plasticity in auditory detection improvement after training.
  • To differentiate between attention-based and plasticity-based learning mechanisms.
  • To examine neural correlates of auditory learning using electroencephalography (EEG).

Main Methods:

  • Participants were trained to detect specific auditory tones (861 Hz or 1058 Hz) at various noise levels.
  • Following training, participants performed a detection task with trained and untrained frequencies.
  • Electroencephalography (EEG) was recorded during passive tone presentation to measure auditory evoked potentials (AEPs), specifically the P2 component.

Main Results:

  • Listeners showed higher detection accuracy and confidence for trained frequencies compared to untrained ones, indicating learning.
  • The P2 component of the auditory evoked potential was larger in amplitude for trained frequencies during passive listening.
  • Global field power analysis also revealed stronger neural responses to trained tones in the P2 time window.

Conclusions:

  • Training-induced improvements in auditory detection are not solely due to selective attention.
  • Long-term changes in neural representations of sound frequencies likely play a significant role in auditory learning.
  • These findings highlight the brain's plasticity in adapting to auditory stimuli through practice.