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Temporal Structure of Item Presentation Modulates Brain Oscillations in Verbal Working Memory.

Alexandra I Kosachenko1, Danil I Syttykov1, Dmitrii A Tarasov1

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Alpha power changes during verbal working memory (WM) retention depend on stimulus presentation timing. Specific temporal structures, like pauses, uniquely influence alpha dynamics, suggesting roles beyond simple sensory gating.

Keywords:
EEGalphabetathetaworking memory

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Area of Science:

  • Cognitive Neuroscience
  • Neuroscience
  • Psychology

Background:

  • Previous research on verbal working memory (WM) shows conflicting alpha power changes during memory retention.
  • These inconsistencies may stem from variations in how stimuli are presented during memory tasks.

Purpose of the Study:

  • To investigate if stimulus presentation modes affect alpha power dynamics during verbal working memory retention.
  • To explore the relationship between encoding processes, presentation modes, and recall accuracy.

Main Methods:

  • Thirty adults memorized seven digits presented simultaneously or sequentially (Fast, Slow, Fast+delay).
  • EEG was recorded during encoding and a 6-second retention period, analyzing theta, alpha, and beta frequency bands.
  • Single-trial models assessed the link between neural activity and recall performance.

Main Results:

  • Encoding showed load-related theta increases and beta decreases.
  • Deeper alpha suppression during encoding correlated with better recall.
  • Retention alpha power was not significantly different across most modes, except for a unique below-baseline alpha in the Fast+delay condition.

Conclusions:

  • Alpha power dynamics during WM retention are sensitive to the temporal structure of stimulus presentation, including inter-stimulus intervals.
  • Alpha modulation in WM retention may involve processes more complex than basic sensory gating.