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Gamma-phase shifting in awake monkey visual cortex.

Martin Vinck¹, Bruss Lima, Thilo Womelsdorf

¹Donders Institute for Brain, Cognition, and Behaviour, Radboud University Nijmegen, 6525 EN Nijmegen, The Netherlands.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience

|January 29, 2010

Summary

This summary is machine-generated.

Neurons synchronize their firing times to the gamma rhythm. Stronger activation causes neurons to fire earlier in the gamma cycle, a phenomenon termed gamma-phase shifting, impacting neural communication.

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Area of Science:

Neuroscience
Computational Neuroscience
Systems Neuroscience

Background:

Gamma-band synchronization is a prevalent neural phenomenon.
Research typically focuses on the strength or precision of gamma synchronization.
The specific timing (phase) of neuronal spikes within the gamma cycle is less explored.

Purpose of the Study:

To investigate if individual neuronal spike timing systematically shifts within the gamma cycle.
To determine if these shifts correlate with neuronal activation strength.
To explore the implications of such phase shifts for neural processing and plasticity.

Main Methods:

Analysis of neuronal spike times in relation to the gamma-band rhythm.
Quantification of neuronal activation strength.
Examination of gamma-phase shifting across different synchronization strengths and neuronal coupling.

Main Results:

Observed systematic shifts in spike timing within the gamma cycle (gamma-phase shifting).
Stronger neuronal activation led to earlier spiking within the gamma cycle.
Gamma-phase shifting was more pronounced during weaker gamma synchronization and for weakly coupled neurons.

Conclusions:

Neuronal activation strength influences spike timing within the gamma cycle.
Gamma-phase shifting occurs rapidly and is modulated by network states.
This phenomenon may have significant implications for neural coding, competition, and spike-timing-dependent plasticity.