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The Spatial Reach of Neuronal Coherence and Spike-Field Coupling across the Human Neocortex.

John C Myers1, Elliot H Smith2,3, Marcin Leszczynski4

  • 1Department of Neurosurgery, Baylor College of Medicine, Houston, Texas 77030 john.myers@bcm.edu.

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Neuronal coherence, crucial for brain communication, extends locally up to 3 cm across the neocortex. Alpha oscillations are key for spike timing, while delta waves support longer-range signaling.

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coherenceneural oscillationsspatial reachspike-field coherence

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Cognitive Neuroscience

Background:

  • Neuronal coherence synchronizes brain activity, supporting plasticity and learning.
  • The spatial extent of neuronal phase synchronization across the neocortex is not well understood.
  • Understanding functional connectivity's spatial reach is vital for brain communication models.

Purpose of the Study:

  • To investigate the spatial reach of neuronal coherence and spike-field coherence (SFC) in the human neocortex.
  • To determine the effective range of local neuronal communication.
  • To analyze the influence of spectral frequency on coherence magnitude and spatial spread.

Main Methods:

  • Simultaneous electrocorticography (ECoG) and high-density microelectrode array recordings in humans during cognitive tasks.
  • Analysis of coherence and SFC across frontal, temporal, and occipital cortices.
  • Power law decay analysis to model coherence magnitude as a function of distance.

Main Results:

  • Neuronal coherence was strongest within a 2-3 cm radius, suggesting a local communication range.
  • Coherence magnitude decayed with distance following a power law (ECoG > LFP > SFC).
  • Alpha oscillations showed higher coherence near microelectrodes, while delta oscillations were more prominent at greater distances.

Conclusions:

  • Neuronal coherence has a defined local spatial reach (approx. 3 cm) across different brain regions and tasks.
  • Alpha oscillations play a significant role in local spike timing, whereas delta oscillations may support broader communication.
  • This study advances understanding of the spatiotemporal dynamics of neuronal synchronization in the human brain.