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Related Experiment Video

Updated: Oct 14, 2025

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Intracortical Directed Connectivity for Information Retention in Visual-Spatial Working Memory.

E S Mikhailova1, A V Kurgansky2,3, R A Nushtaeva4

  • 1Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, 117485, Moscow, Russia. esmikhailova@mail.ru.

Doklady Biological Sciences : Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
|November 3, 2021
PubMed
Summary
This summary is machine-generated.

The frontal cortex modulates visual areas during working memory (WM) tasks. Connectivity patterns differ in theta and alpha frequencies between stimulus anticipation and retention stages.

Keywords:
EEG rhythmsdirected coherencehuman subjectorientation selectivityworking memory

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Brain Connectivity

Background:

  • Working memory (WM) involves maintaining and manipulating information.
  • The frontal cortex plays a crucial role in executive functions, including WM.
  • Understanding directed connectivity between brain regions is key to elucidating WM mechanisms.

Purpose of the Study:

  • To investigate the effective connectivity between frontal and postcentral cortical regions during a visual working memory task.
  • To examine the frequency-dependent dynamics of top-down influences from the frontal cortex to visual areas.
  • To confirm the role of the frontal cortex as a control center in the WM system.

Main Methods:

  • Utilized electroencephalography (EEG) in 27 healthy young adults.
  • Employed vector autoregression modeling to assess effective connectivity.
  • Analyzed connectivity patterns during stimulus anticipation and retention phases of a visual WM task.

Main Results:

  • Top-down right-hemispheric connectivity from frontal to visual areas was weaker in the theta frequency band during stimulus retention compared to anticipation.
  • Conversely, descending influences in the alpha frequency band were slightly more intense during retention.
  • Demonstrated frequency-dependent dynamics in frontal-visual cortical interactions.

Conclusions:

  • The frontal cortex exerts frequency-specific control over visual processing during working memory.
  • Theta band connectivity reflects reduced top-down influence during WM retention.
  • Alpha band connectivity suggests sustained or increased top-down modulation during WM retention, supporting the frontal cortex's role as a control center.