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On the existence of synchrostates in multichannel EEG signals during face-perception tasks

On the existence of synchrostates in multichannel EEG signals during face-perception tasks
On the existence of synchrostates in multichannel EEG signals during face-perception tasks
Phase synchronisation in multichannel EEG is known as the manifestation of functional brain connectivity. Traditional phase synchronisation studies are mostly based on time average synchrony measures hence do not preserve the temporal evolution of the phase difference. Here we propose a new method to show the existence of a small set of unique phase synchronised patterns or “states” in multi-channel EEG recordings, each “state” being stable of the order of ms, from typical and pathological subjects during face perception tasks. The proposed methodology bridges the concepts of EEG microstates and phase synchronisation in time and frequency domain respectively. The analysis is reported for four groups of children including typical, Autism Spectrum Disorder (ASD), low and high anxiety subjects – a total of 44 subjects. In all cases, we observe consistent existence of these states - termed as synchrostates - within specific cognition related frequency bands (beta and gamma bands), though the topographies of these synchrostates differ for different subject groups with different pathological conditions. The inter-synchrostate switching follows a well-defined sequence capturing the underlying inter-electrode phase relation dynamics in stimulus- and person-centric manner. Our study is motivated from the well-known EEG microstate exhibiting stable potential maps over the scalp. However, here we report a similar observation of quasi-stable phase synchronised states in multichannel EEG. The existence of the synchrostates coupled with their unique switching sequence characteristics could be considered as a potentially new field over contemporary EEG phase synchronisation studies.
15002
Jamal, Wasifa
3f70176e-843e-46b7-8447-4eefaef104f1
Das, Saptarshi
e06f2eb0-1e3e-453c-ba78-82eed18ceac9
Maharatna, Koushik
93bef0a2-e011-4622-8c56-5447da4cd5dd
Apicella, Fabio
dad56776-dd88-41ab-a190-58537d29ab32
Chronaki, Georgia
3b00f885-0772-423f-ac68-a5f35b75993f
Sicca, Federico
eca600aa-5535-4bff-b5ac-9b82ff3fe034
Cohen, David
ada227d5-129b-4db3-8a0d-0f72aa6b473b
Muratori, Filippo
72a8f12f-671c-40e6-b3bc-219d497b6d76
Jamal, Wasifa
3f70176e-843e-46b7-8447-4eefaef104f1
Das, Saptarshi
e06f2eb0-1e3e-453c-ba78-82eed18ceac9
Maharatna, Koushik
93bef0a2-e011-4622-8c56-5447da4cd5dd
Apicella, Fabio
dad56776-dd88-41ab-a190-58537d29ab32
Chronaki, Georgia
3b00f885-0772-423f-ac68-a5f35b75993f
Sicca, Federico
eca600aa-5535-4bff-b5ac-9b82ff3fe034
Cohen, David
ada227d5-129b-4db3-8a0d-0f72aa6b473b
Muratori, Filippo
72a8f12f-671c-40e6-b3bc-219d497b6d76

Jamal, Wasifa, Das, Saptarshi, Maharatna, Koushik, Apicella, Fabio, Chronaki, Georgia, Sicca, Federico, Cohen, David and Muratori, Filippo (2015) On the existence of synchrostates in multichannel EEG signals during face-perception tasks. Biomedical Physics & Engineering Express, 1 (1), 15002. (doi:10.1088/2057-1976/1/1/015002).

Record type: Article

Abstract

Phase synchronisation in multichannel EEG is known as the manifestation of functional brain connectivity. Traditional phase synchronisation studies are mostly based on time average synchrony measures hence do not preserve the temporal evolution of the phase difference. Here we propose a new method to show the existence of a small set of unique phase synchronised patterns or “states” in multi-channel EEG recordings, each “state” being stable of the order of ms, from typical and pathological subjects during face perception tasks. The proposed methodology bridges the concepts of EEG microstates and phase synchronisation in time and frequency domain respectively. The analysis is reported for four groups of children including typical, Autism Spectrum Disorder (ASD), low and high anxiety subjects – a total of 44 subjects. In all cases, we observe consistent existence of these states - termed as synchrostates - within specific cognition related frequency bands (beta and gamma bands), though the topographies of these synchrostates differ for different subject groups with different pathological conditions. The inter-synchrostate switching follows a well-defined sequence capturing the underlying inter-electrode phase relation dynamics in stimulus- and person-centric manner. Our study is motivated from the well-known EEG microstate exhibiting stable potential maps over the scalp. However, here we report a similar observation of quasi-stable phase synchronised states in multichannel EEG. The existence of the synchrostates coupled with their unique switching sequence characteristics could be considered as a potentially new field over contemporary EEG phase synchronisation studies.

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Accepted/In Press date: 23 June 2015
e-pub ahead of print date: 16 July 2015
Organisations: Electronic & Software Systems

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Local EPrints ID: 379527
URI: https://eprints.soton.ac.uk/id/eprint/379527
PURE UUID: 7cf30b4f-10df-4332-b763-d804e39cdd90

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Date deposited: 28 Jul 2015 16:48
Last modified: 09 Sep 2019 18:38

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