RT Journal Article
SR Electronic
T1 Very high density EEG elucidates spatiotemporal aspects of early visual processing
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 172353
DO 10.1101/172353
A1 Amanda K Robinson
A1 Praveen Venkatesh
A1 Matthew J. Boring
A1 Michael J. Tarr
A1 Pulkit Grover
A1 Marlene Behrmann
YR 2017
UL http://biorxiv.org/content/early/2017/08/04/172353.abstract
AB Standard human EEG systems based on spatial Nyquist estimates suggest that 20-30 mm electrode spacing suffices to capture neural signals on the scalp, but recent studies posit that increasing sensor density can provide higher resolution neural information. Here, we compared “super-Nyquist” density EEG (“SND”) with Nyquist density (“ND”) arrays for assessing the spatiotemporal aspects of early visual processing. EEG was measured from 128 electrodes arranged over occipitotemporal brain regions (14 mm spacing) while participants viewed flickering checkerboard stimuli. Analyses compared SND with ND-equivalent subsets of the same electrodes. Frequency-tagged stimuli were classified more accurately with SND than ND arrays in both the time and the frequency domains. Representational similarity analysis revealed that a computational model of V1 correlated more highly with the SND than the ND array. Overall, SND EEG captured more neural information from visual cortex, arguing for increased development of this approach in basic and translational neuroscience.SND“super-Nyquist” density EEG (smaller than 20-30 mm electrode spacing)NDNyquist density EEG (20-30 mm electrode spacing)