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Reactivating ordinal position information from auditory sequence memory in human brains.

Ying Fan1,2,3, Huan Luo1,2,3

  • 1School of Psychological and Cognitive Sciences, Peking University, Haidian District, 100871, Beijing, China.

Cerebral Cortex (New York, N.Y. : 1991)
|December 2, 2022
PubMed
Summary

This study reveals how the brain retains auditory sequence order in working memory (WM). New methods show neural reactivation of ordinal position, linked to memory recall and exhibiting stable-dynamic coding.

Keywords:
EEGauditory working memoryimpulse-responseordinal positionreactivationsequence memory

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Area of Science:

  • Cognitive Neuroscience
  • Neuroscience
  • Auditory Perception

Background:

  • Retaining event order is crucial for cognitive functions like speech and memory.
  • Working memory (WM) research has focused on content, with less known about auditory sequence ordinal coding.
  • Efficient methods to access stored ordinal position codes during WM retention are lacking.

Purpose of the Study:

  • To investigate how ordinal position information of auditory sequences is retained in the human brain during WM.
  • To develop and validate an efficient approach for accessing stored ordinal position codes.
  • To characterize the neural coding of ordinal position in auditory WM.

Main Methods:

  • 31 participants completed an auditory sequence WM task.
  • Electroencephalography (EEG) recorded brain activity.
  • Novel triggering events were used to reactivate neural representations of ordinal position during the delay period.

Main Results:

  • Successfully reactivated neural representations of ordinal position during WM retention.
  • Ordinal position reactivation correlated with recognition behavior, validating its role in WM storage.
  • The ordinal position code exhibited a 'stable-dynamic' format, showing consistent neural trajectories during encoding and reactivation.

Conclusions:

  • Developed an effective method to access behaviorally relevant ordinal position information in auditory sequence WM.
  • Revealed novel temporal characteristics of ordinal position coding in WM.
  • Demonstrated the neural basis of sequence order retention in auditory working memory.