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Related Experiment Video

Updated: May 20, 2026

Combined Invasive Subcortical and Non-invasive Surface Neurophysiological Recordings for the Assessment of Cognitive and Emotional Functions in Humans

Combined Invasive Subcortical and Non-invasive Surface Neurophysiological Recordings for the Assessment of Cognitive and Emotional Functions in Humans

Published on: May 19, 2016

Communication before coherence.

Edmund T Rolls¹, Tristan J Webb, Gustavo Deco

¹Oxford Centre for Computational Neuroscience, Oxford, UK. edmund.rolls@oxcns.org

The European Journal of Neuroscience

|July 12, 2012

Summary

This summary is machine-generated.

Neural communication can occur without synchronized brain oscillations. Information transmission between networks happens even with weak connections, before coherence is established, challenging the communication through coherence hypothesis.

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Area of Science:

Neuroscience
Computational Neuroscience
Systems Neuroscience

Background:

The communication through coherence hypothesis suggests synchronous neural oscillations facilitate information transfer between brain regions.
This hypothesis has primarily focused on the interaction of oscillations within connected networks.

Purpose of the Study:

To investigate whether gamma oscillations and their coherence influence information transmission between neural networks.
To determine the role of oscillation phase in information transfer about external stimuli.

Main Methods:

Simulations were used to model information transmission between two networks.
Gamma oscillations were induced by modulating AMPA/NMDA synaptic conductance ratios.
Information transmission was quantified using Shannon mutual information.

Main Results:

Weak associative connection strengths were sufficient for significant information transmission, enabling accurate decision-making in the second network.
Perfect information transmission was achieved without coherence or phase-locking between networks.
Coherence was only observed at connection strengths over 10 times higher than those sufficient for information transfer.
Oscillation phase did not impact information transmission speed or accuracy.
Information transmission remained high even without gamma oscillations or at normal AMPA/NMDA ratios.

Conclusions:

Information transmission between neural networks can occur independently of oscillation coherence.
Synaptic connections do not need to be strong enough to induce coherence for effective information transfer.
The findings challenge the necessity of coherence for neural communication, suggesting information transfer precedes synchronization.