Parametric variation of gamma frequency and power with luminance contrast: A comparative study of human MEG and monkey LFP and spike responses

NeuroImage
A HadjipapasP De Weerd

Abstract

Gamma oscillations contribute significantly to the manner in which neural activity is bound into functional assemblies. The mechanisms that underlie the human gamma response, however, are poorly understood. Previous computational models of gamma rely heavily on the results of invasive recordings in animals, and it is difficult to assess whether these models hold in humans. Computational models of gamma predict specific changes in gamma spectral response with increased excitatory drive. Hence, differences and commonalities between spikes, LFPs and MEG in the spectral responses to changes in excitatory drive can lead to a refinement of existing gamma models. We compared gamma spectral responses to varying contrasts in a monkey dataset acquired previously (Roberts et al., 2013) with spectral responses to similar contrast variations in a new human MEG dataset. We found parametric frequency shifts with increasing contrast in human MEG at the single-subject and the single-trial level, analogous to those observed in the monkey. Additionally, we observed parametric modulations of spectral asymmetry, consistent across spikes, LFP and MEG. However, while gamma power scaled linearly with contrast in MEG, it saturated at high contrasts in ...Continue Reading

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Citations

Nov 9, 2015·The European Journal of Neuroscience·E LowetP De Weerd
Apr 16, 2016·The Journal of Physiology·Torbjørn V NessGaute T Einevoll
Sep 1, 2017·ELife·Eric LowetPeter De Weerd
Apr 26, 2018·Journal of Neurophysiology·Siddhesh SalelkarSupratim Ray
May 1, 2015·Journal of Neurophysiology·Elena V OrekhovaTatiana A Stroganova
Oct 24, 2019·Journal of Neurophysiology·A AlishbayliB Englitz
Jun 2, 2018·Scientific Reports·Elena V OrekhovaTatiana A Stroganova
Jul 22, 2018·Journal of Vision·Nina N ThigpenAndreas Keil
Apr 4, 2019·Cerebral Cortex·Mark J RobertsPeter De Weerd
Oct 11, 2020·Nature Communications·Niklas WilmingTobias H Donner
Dec 18, 2020·PloS One·Gavin PerryKrish D Singh
May 6, 2021·Cell Reports·Christopher Murphy LewisPascal Fries
Jun 10, 2021·Scientific Reports·Viktoriya O ManyukhinaElena V Orekhova

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