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Neurophotonics • Open Access

Concurrent measurement of cerebral hemodynamics and electroencephalography during transcranial direct current stimulation
Author(s): Martina Giovannella; David Ibañez; Clara Gregori-Pla; Michal Kacprzak; Guillem Mitjà; Giulio Ruffini; Turgut Durduran

Paper 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.

Paper Details

Date Published: 25 January 2018
PDF: 12 pages
Neurophoton. 5(1) 015001 doi: 10.1117/1.NPh.5.1.015001
Published in: Neurophotonics Volume 5, Issue 1
Show Author Affiliations
Martina Giovannella, ICFO - Institut de Ciències Fotòniques (Spain)
David Ibañez, Starlab (Spain)
Clara Gregori-Pla, ICFO - Institut de Ciències Fotòniques (Spain)
Michal Kacprzak, ICFO - Institut de Ciències Fotòniques (Spain)
Guillem Mitjà, Neuroelectrics (Spain)
Giulio Ruffini, Starlab (Spain)
Neuroelectrics (Spain)
Turgut Durduran, ICFO - Institut de Ciències Fotòniques (Spain)
Institució Catalana de Recerca i Estudis Avançats (Spain)

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