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Binding of cortical functional modules by synchronous high-frequency oscillations.

Jacob C Garrett1, Ilya A Verzhbinsky1,2, Erik Kaestner3

  • 1Neurosciences Graduate Program, University of California, San Diego, La Jolla, CA, USA.

Nature Human Behaviour
|August 12, 2024
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Summary

High-frequency brain oscillations called cortico-cortical co-ripples synchronize across brain regions during reading and semantic tasks. These synchronized oscillations may facilitate information binding in the brain.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Electrophysiology

Background:

  • The role of high-frequency phase-locked oscillations in integrating information across cortical areas remains debated.
  • Understanding neural mechanisms of information binding is crucial for cognitive neuroscience.

Purpose of the Study:

  • To investigate the involvement of cortico-cortical co-ripples in information binding during cognitive tasks.
  • To determine the timing, location, and characteristics of co-ripples during reading and semantic decisions.

Main Methods:

  • Intracranial electroencephalography (iEEG) was used to record brain activity.
  • Analysis focused on ~90 Hz oscillations (co-ripples) and their synchronization across cortical areas.
  • Non-oscillatory high gamma activity was used as a control for general co-activation.

Main Results:

  • Cortico-cortical co-ripples significantly increased during reading and semantic decision tasks.
  • Fusiform wordform areas co-rippled with language areas, peaking 200-400 ms post-word onset.
  • Co-ripples were phase-locked over long distances (>12 cm), suggesting widespread integration.
  • Co-activation (high gamma) preceded co-ripple activity.

Conclusions:

  • Widespread synchronous cortico-cortical co-ripples may play a key role in integrating information across distributed brain networks.
  • These oscillations appear to support sustained cognitive processes like reading and semantic processing.
  • The findings provide evidence for a specific neural mechanism underlying information binding in the human brain.