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High-gamma band fronto-temporal coherence as a measure of functional connectivity in speech motor control
Journal article   Peer reviewed

High-gamma band fronto-temporal coherence as a measure of functional connectivity in speech motor control

Johnathan Kingyon, Roozbeh Behroozmand, Ryan Kelley, Hiroyuki Oya, Hiroto Kawasaki, Nandakumar S. Narayanan and Jeremy D. W. Greenlee
Neuroscience, Vol.305, pp.15-25
10/01/2015
DOI: 10.1016/j.neuroscience.2015.07.069
PMCID: PMC4747053
PMID: 26232713
url
https://www.ncbi.nlm.nih.gov/pmc/articles/4747053View
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Abstract

The neural basis of human speech is unclear. Intracranial electrophysiological recordings have revealed that high-gamma band oscillations (70–150 Hz) are observed in frontal lobe during speech production and in the temporal lobe during speech perception. Here, we tested the hypothesis that the frontal and temporal brain regions had high-gamma coherence during speech. We recorded electrocorticography (ECoG) from the frontal and temporal cortices of five humans who underwent surgery for medically intractable epilepsy, and studied coherence between frontal and temporal cortex during vocalization and playback of vocalization. We report two novel results. First, we observed high-gamma band as well as theta (4–8 Hz) coherence between frontal and temporal lobes. Second, both high-gamma and theta coherence were stronger when subjects were actively vocalizing as compared to playback of the same vocalizations. These findings provide evidence that coupling between sensory-motor networks measured by high-gamma coherence plays a key role in feedback-based monitoring and control of vocal output for human vocalization.
 Auditory cortex ECoG efference copy LFP Premotor cortex speech

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