Concurrent measurement of cerebral hemodynamics and electroencephalography during transcranial direct current stimulation

Martina Giovannella; David Ibañez; Clara Gregori-Pla; Michal Kacprzak; Guillem Mitjà; Giulio Ruffini; Turgut Durduran

doi:10.1117/1.NPh.5.1.015001

25 January 2018 Concurrent measurement of cerebral hemodynamics and electroencephalography during transcranial direct current stimulation

Martina Giovannella, David Ibañez, Clara Gregori-Pla, Michal Kacprzak, Guillem Mitjà, Giulio Ruffini, Turgut Durduran

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Neurophotonics, Vol. 5, Issue 1, 015001 (January 2018). https://doi.org/10.1117/1.NPh.5.1.015001

Abstract

Transcranial direct current stimulation (tDCS) is currently being used for research and treatment of some neurological and neuropsychiatric disorders, as well as for improvement of cognitive functions. In order to better understand cerebral response to the stimulation and to redefine protocols and dosage, its effects must be monitored. To this end, we have used functional diffuse correlation spectroscopy (fDCS) and time-resolved functional near-infrared spectroscopy (TR-fNIRS) together with electroencephalography (EEG) during and after stimulation of the frontal cortex. Twenty subjects participated in two sessions of stimulation with two different polarity montages and twelve also underwent a sham session. Cerebral blood flow and oxyhemoglobin concentration increased during and after active stimulation in the region under the stimulation electrode while deoxyhemoglobin concentration decreased. The EEG spectrum displayed statistically significant power changes across different stimulation sessions in delta (2 to 4 Hz), theta (4 to 8 Hz), and beta (12 to 18 Hz) bands. Results suggest that fDCS and TR-fNIRS can be employed as neuromonitors of the effects of transcranial electrical stimulation and can be used together with EEG.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Martina Giovannella, David Ibañez, Clara Gregori-Pla, Michal Kacprzak, Guillem Mitjà, Giulio Ruffini, and Turgut Durduran "Concurrent measurement of cerebral hemodynamics and electroencephalography during transcranial direct current stimulation," Neurophotonics 5(1), 015001 (25 January 2018). https://doi.org/10.1117/1.NPh.5.1.015001

Received: 27 September 2017; Accepted: 20 December 2017; Published: 25 January 2018

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