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A study of the electro-haemodynamic coupling using simultaneously acquired intracranial EEG and fMRI data in humans.

Abstract：

:In current fMRI studies designed to map BOLD changes related to interictal epileptiform discharges (IED), which are recorded on simultaneous EEG, the information contained in the morphology and field extent of the EEG events is exclusively used for their classification. Usually, a BOLD predictor based on IED onset times alone is constructed, effectively treating all events as identical. We used intracranial EEG (icEEG)-fMRI data simultaneously recorded in humans to investigate the effect of including any of the features: amplitude, width (duration), slope of the rising phase, energy (area under the curve), or spatial field extent (number of contacts over which the sharp wave was observed) of the fast wave of the IED (the sharp wave), into the BOLD model, to better understand the neurophysiological origin of sharp wave-related BOLD changes, in the immediate vicinity of the recording contacts. Among the features considered, the width was the only one found to explain a significant amount of additional variance, suggesting that the amplitude of the BOLD signal depends more on the duration of the underlying field potential (reflected in the sharp wave width) than on the degree of neuronal activity synchrony (reflected in the sharp wave amplitude), and, consequently, that including inter-event variations of the sharp wave width in the BOLD signal model may increase the sensitivity of forthcoming EEG-fMRI studies of epileptic activity.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Murta T,Hu L,Tierney TM,Chaudhary UJ,Walker MC,Carmichael DW,Figueiredo P,Lemieux L

doi

10.1016/j.neuroimage.2016.08.001

subject

Has Abstract

pub_date

2016-11-15 00:00:00

pages

371-380

eissn

1053-8119

issn

1095-9572

pii

S1053-8119(16)30377-9

journal_volume

142

pub_type

杂志文章

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