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Setting up the speech production network: how oscillations contribute to lateralized information routing.

Gehrig J, Wibral M, Arnold C, Kell CA - Front Psychol (2012)

Bottom Line: This MEG study focuses on the spectro-temporal dynamics that contribute to the setup of this network.While a broadband low frequency effect was found for any task preparation in bilateral prefrontal cortices, preparation for overt speech production was specifically associated with left-lateralized alpha and beta suppression in temporal cortices and beta suppression in motor-related brain regions.Beta phase coupling in the entire speech production network was modulated by anticipation of overt reading.

View Article: PubMed Central - PubMed

Affiliation: Cognitive Neuroscience Group, Department of Neurology, Brain Imaging Center, Goethe University Frankfurt, Germany.

ABSTRACT
Speech production involves widely distributed brain regions. This MEG study focuses on the spectro-temporal dynamics that contribute to the setup of this network. In 21 participants performing a cue-target reading paradigm, we analyzed local oscillations during preparation for overt and covert reading in the time-frequency domain and localized sources using beamforming. Network dynamics were studied by comparing different dynamic causal models of beta phase coupling in and between hemispheres. While a broadband low frequency effect was found for any task preparation in bilateral prefrontal cortices, preparation for overt speech production was specifically associated with left-lateralized alpha and beta suppression in temporal cortices and beta suppression in motor-related brain regions. Beta phase coupling in the entire speech production network was modulated by anticipation of overt reading. We propose that the processes underlying the setup of the speech production network connect relevant brain regions by means of beta synchronization and prepare the network for left-lateralized information routing by suppression of inhibitory alpha and beta oscillations.

No MeSH data available.


Related in: MedlinePlus

Scalp-frequency plots of the first second of the preparation (Prep) period for covert and overt speech production vs. baseline and for preparation for overt vs. preparation for covert speech production. Pseudo t-values are color-coded from −5 to 5. Results are cluster corrected (p < 0.05).
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Figure 3: Scalp-frequency plots of the first second of the preparation (Prep) period for covert and overt speech production vs. baseline and for preparation for overt vs. preparation for covert speech production. Pseudo t-values are color-coded from −5 to 5. Results are cluster corrected (p < 0.05).

Mentions: Preparation for overt or covert speaking was not associated with mouth movements. When analyzing the classical frequency bands, anterior sensors exhibited a condition-independent power increase ranging from delta to beta frequencies while posterior sensors showed suppression of alpha and beta power. No gamma effect was observed (Figure 3).


Setting up the speech production network: how oscillations contribute to lateralized information routing.

Gehrig J, Wibral M, Arnold C, Kell CA - Front Psychol (2012)

Scalp-frequency plots of the first second of the preparation (Prep) period for covert and overt speech production vs. baseline and for preparation for overt vs. preparation for covert speech production. Pseudo t-values are color-coded from −5 to 5. Results are cluster corrected (p < 0.05).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3368321&req=5

Figure 3: Scalp-frequency plots of the first second of the preparation (Prep) period for covert and overt speech production vs. baseline and for preparation for overt vs. preparation for covert speech production. Pseudo t-values are color-coded from −5 to 5. Results are cluster corrected (p < 0.05).
Mentions: Preparation for overt or covert speaking was not associated with mouth movements. When analyzing the classical frequency bands, anterior sensors exhibited a condition-independent power increase ranging from delta to beta frequencies while posterior sensors showed suppression of alpha and beta power. No gamma effect was observed (Figure 3).

Bottom Line: This MEG study focuses on the spectro-temporal dynamics that contribute to the setup of this network.While a broadband low frequency effect was found for any task preparation in bilateral prefrontal cortices, preparation for overt speech production was specifically associated with left-lateralized alpha and beta suppression in temporal cortices and beta suppression in motor-related brain regions.Beta phase coupling in the entire speech production network was modulated by anticipation of overt reading.

View Article: PubMed Central - PubMed

Affiliation: Cognitive Neuroscience Group, Department of Neurology, Brain Imaging Center, Goethe University Frankfurt, Germany.

ABSTRACT
Speech production involves widely distributed brain regions. This MEG study focuses on the spectro-temporal dynamics that contribute to the setup of this network. In 21 participants performing a cue-target reading paradigm, we analyzed local oscillations during preparation for overt and covert reading in the time-frequency domain and localized sources using beamforming. Network dynamics were studied by comparing different dynamic causal models of beta phase coupling in and between hemispheres. While a broadband low frequency effect was found for any task preparation in bilateral prefrontal cortices, preparation for overt speech production was specifically associated with left-lateralized alpha and beta suppression in temporal cortices and beta suppression in motor-related brain regions. Beta phase coupling in the entire speech production network was modulated by anticipation of overt reading. We propose that the processes underlying the setup of the speech production network connect relevant brain regions by means of beta synchronization and prepare the network for left-lateralized information routing by suppression of inhibitory alpha and beta oscillations.

No MeSH data available.


Related in: MedlinePlus