Functional frontoparietal connectivity during short-term memory as revealed by high-resolution EEG coherence analysis

Area of Science:

• Neuroscience
• Cognitive Science
• Electrophysiology

Background:

• Short-term memory (STM) relies on the coordinated activity of various brain regions.
• Understanding the functional connectivity between frontal and parietal areas is key to elucidating STM mechanisms.

Purpose of the Study:

• To model functional connectivity between frontal and parietal areas during STM.
• To investigate the directionality of information flow during STM using electroencephalography (EEG).

Main Methods:

• Electroencephalography (EEG) was employed to record brain activity.
• Spectral coherence analysis and directed transfer function were used to assess functional connectivity and information flow.
• A no-STM task served as a control condition.

Main Results:

• Increased frontoparietal EEG coherence was observed at high frequencies (beta and gamma bands, 14-45 Hz) during STM.
• While parietal-to-frontal flow dominated in the control task, STM exhibited bidirectional frontoparietal flow, particularly in the gamma band.
• Frontal areas showed an increased influence on parietal areas during memory retention.

Conclusions:

• Frontoparietal connectivity plays a vital role in optimizing representational memory during STM.
• The bidirectional communication between frontal and parietal regions supports memory retention processes.
• EEG-based connectivity analysis provides insights into the neural dynamics of short-term memory.