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Related Experiment Video

Updated: Jan 9, 2026

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Intrinsic neural timescales shape memory encoding and retrieval.

Shen Xinyu1, Cui Xiaoyu1, Yasir Çatal2

  • 1Center on Aging Psychology, CAS Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, China; Department of Psychology, University of Chinese Academy of Sciences, Beijing, China.

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The brain

Keywords:
Autocorrelation windowEEG, Cognitive dynamicsIntrinsic neural timescalesMemory encoding and retrievalTemporal integration and segregation

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Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • Encoding and retrieval are distinct memory processes.
  • Recent models suggest a continuum between encoding and retrieval.
  • Neural mechanisms underlying these processes across timescales are unclear.

Purpose of the Study:

  • Investigate the brain's intrinsic neural timescales (INT) during memory encoding and retrieval.
  • Examine how INT connects and differentiates these memory stages.
  • Determine the predictive power of INT for memory performance.

Main Methods:

  • Utilized electroencephalography (EEG) to measure the autocorrelation window (ACW) as a proxy for INT.
  • Recorded ACW during memory encoding (spatial fit judgment) and retrieval tasks.
  • Assessed behavioral measures including precision, false alarms, and accuracy.

Main Results:

  • Found a direct behavioral link between encoding and retrieval performance.
  • Observed state-dependent neural differentiation: longer ACW during encoding (integration) and shorter ACW during retrieval (segregation).
  • Demonstrated stable, trait-like ACW across rest and memory states, predicting higher memory accuracy and fewer false alarms.

Conclusions:

  • The brain's INT, measured by ACW, both connects and differentiates memory encoding and retrieval.
  • Trait-like ACW stability is crucial for predicting memory performance.
  • Findings support dynamic temporal models of memory, highlighting the role of INT.