Global field power and topographic similarity

Brain Topography
W Skrandies

Abstract

Multichannel recordings are commonly presented as topographic maps series displaying the change of the potential distribution over time. When reviewing a sequence of potential maps it becomes obvious that there are epochs with only little activity (few field lines; small extrema values) while at other times the fields display high peaks and deep troughs with steep gradients. The measure of global field power (GFP) corresponds to the spatial standard deviation, and it quantifies the amount of activity at each time point in the field considering the data from all recording electrodes simultaneously resulting in a reference-independent descriptor of the potential field. Global field power is plotted as a function of time, and the occurrence times of GFP maxima are used to determine the latencies of evoked potential components. The topographical change occurring in subsequent potential field distributions may also be quantified by computing an index of global dissimilarity. Global field power and global dissimilarity show a complementary behavior over time: in general, high GFP is associated with similar fields while during periods between GFP peaks the topographic patterns of successive field distributions change rapidly accompani...Continue Reading

References

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Citations

Jan 1, 1993·Brain Topography·W Skrandies
Jan 1, 1992·Brain Topography·P ValdésR Biscay
Mar 19, 2008·Brain Topography·Micah M MurrayChristoph M Michel
Oct 12, 2012·Brain Topography·Julian RelleckeAnnekathrin Schacht
Jan 7, 2014·Neuropsychologia·Styliani TsigkaGabriele Miceli
Sep 14, 2011·Neuropsychobiology·Chisako IkedaHeii Arai
Apr 5, 2013·PloS One·Stéphanie RièsF-Xavier Alario
Jul 14, 2012·Journal of Pain Research·Emanuel N van den BroekeOliver Hg Wilder-Smith
Nov 15, 2011·Brain Topography·Andrew C N ChenFernando L Lopes da Silva
Oct 16, 2013·BMC Neuroscience·Aaron SchurgerStanislas Dehaene
Jan 22, 2013·Amyotrophic Lateral Sclerosis & Frontotemporal Degeneration·Nataša BizovičarJanez Zidar
Mar 31, 2015·NeuroImage·Ulrike ToepelJulie Hudry
Mar 5, 2016·Brain Topography·Benjamin T FilesAmar R Marathe
Jan 1, 2008·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Jemma HineStefan Debener
Aug 9, 2007·International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology·Stefan DebenerRichard W Bowtell
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Oct 26, 2016·Frontiers in Human Neuroscience·Pelle SöderströmMikael Roll
Jun 18, 2017·Journal of Environmental Management·M D Grima MurciaEduardo Fernandez

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