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Communication through coherence with inter-areal delays.

Andre M Bastos1, Julien Vezoli2, Pascal Fries3

  • 1Ernst Strüngmann Institute (ESI) for Neuroscience in Cooperation with Max Planck Society, 60528 Frankfurt, Germany; Picower Institute for Learning and Memory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Current Opinion in Neurobiology
|December 3, 2014
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Summary
This summary is machine-generated.

The communication-through-coherence (CTC) hypothesis is updated: bidirectional brain communication uses separate unidirectional mechanisms with delays, unlike the original zero-phase synchronization idea. This explains rhythmic synchronization in gamma and beta bands.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Systems Neuroscience

Background:

  • The communication-through-coherence (CTC) hypothesis suggests neural communication effectiveness depends on rhythmic synchronization, particularly in gamma and beta bands.
  • Original CTC proposed uni-directional communication via entrainment with delays and non-zero phase, while bi-directional communication used zero-phase synchronization.
  • Recent findings indicate gamma-band synchronization shows non-zero phase lags, challenging the original CTC model for bi-directional communication.

Purpose of the Study:

  • To modify the communication-through-coherence (CTC) hypothesis based on new evidence regarding inter-areal synchronization.
  • To propose a revised model where bi-directional cortical communication is achieved through separate uni-directional CTC mechanisms with delays in each direction.
  • To review existing evidence supporting the segregation of feedforward and feedback inter-areal influences anatomically and spectrally.

Main Methods:

  • Review of existing neuroscientific literature on inter-areal synchronization and communication.
  • Analysis of evidence related to phase lags in gamma-band synchronization.
  • Examination of studies investigating anatomical and spectral segregation of feedforward and feedback pathways.

Main Results:

  • Inter-areal gamma-band synchronization is characterized by non-zero phase lags, contradicting the original CTC hypothesis's zero-phase requirement for bi-directional communication.
  • Evidence suggests that feedforward and feedback inter-areal influences are anatomically and spectrally segregated.
  • The revised CTC hypothesis posits that bi-directional communication is mediated by distinct uni-directional CTC processes, each involving delays.

Conclusions:

  • The communication-through-coherence (CTC) hypothesis is updated to incorporate non-zero phase lags for bi-directional communication.
  • Bi-directional cortical communication is proposed to be implemented via separate uni-directional CTC mechanisms operating with delays in each direction.
  • The findings support a model where distinct neural pathways and frequency bands mediate feedforward and feedback information flow.