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Mismatch negativity as a marker of auditory pattern separation.

Deena Herman1,2, Stevenson Baker1,2, Ricky Chow1,2

  • 1Department of Psychology and Centre for Vision Research, York University, 4700 Keele Street, Toronto, Ontario, M3J 1P3, Canada.

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|July 31, 2023
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Summary

The mismatch negativity (MMN) brain response during auditory change detection correlates with memory precision for similar sounds. This indicates that early sensory discrimination influences later episodic memory recall.

Keywords:
electroencephalography (EEG)episodic memoryevent-related potential (ERP)pattern separation

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Auditory Perception

Background:

  • Incidental memory formation relies on encoding processes.
  • Auditory change detection, measured by mismatch negativity (MMN), reflects early sensory processing.
  • The relationship between MMN and subsequent memory for auditory stimuli is not fully understood.

Purpose of the Study:

  • To investigate the correlation between MMN amplitude and incidental memory performance.
  • To determine if MMN predicts the ability to discriminate auditory targets from lures and foils.
  • To explore how early auditory processing influences episodic memory precision.

Main Methods:

  • A passive auditory oddball task was used to elicit MMN in 30 young adults.
  • Participants were exposed to standard and deviant 5-tone sequences.
  • An incidental memory test assessed discrimination of targets, lures, and foils.

Main Results:

  • Participants showed high sensitivity distinguishing targets from foils and lower sensitivity for targets versus lures.
  • A significant correlation was found between MMN amplitude and lure discrimination.
  • No significant correlation was observed between MMN amplitude and foil discrimination.

Conclusions:

  • MMN amplitude is associated with the precision of memory for similar auditory stimuli.
  • Early sensory discrimination, as indexed by MMN, contributes to fine-grained episodic memory.
  • This study highlights the role of neural change detection in memory accuracy.