S. Muthukumaraswamy

Publications144
h-index39
Citations6,949
Highly Influential Citations516
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Mu rhythm modulation during observation of an object-directed grasp.
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Resting GABA concentration predicts peak gamma frequency and fMRI amplitude in response to visual stimulation in humans
TLDR
The results are supportive of recent theories suggesting that these functional neuroimaging metrics are dependent on the excitation/inhibition balance in an individual's cortex and have important implications for the interpretation of functional imaging results, particularly when making between-group comparisons in clinical research.
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Neural correlates of the LSD experience revealed by multimodal neuroimaging
TLDR
Three complementary neuroimaging techniques, implemented during resting state conditions, revealed marked changes in brain activity after LSD that correlated strongly with its characteristic psychological effects, contributing important new insights into the characteristic hallucinatory and consciousness-altering properties of psychedelics.
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Increased Global Functional Connectivity Correlates with LSD-Induced Ego Dissolution
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Functional properties of human primary motor cortex gamma oscillations.
TLDR
Gamma oscillations in human primary motor cortex (M1) were reliably localized by MEG in M1 and reached peak amplitude 137 ms after electromyographic onset and were not affected by whether movements were cued or self-paced, demonstrating that M1 oscillations are not simply related to somatosensory feedback.
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Broadband Cortical Desynchronization Underlies the Human Psychedelic State
TLDR
The findings suggest that the subjective effects of psychedelics result from a desynchronization of ongoing oscillatory rhythms in the cortex, likely triggered by 5-HT2A receptor-mediated excitation of deep pyramidal cells.
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Orientation Discrimination Performance Is Predicted by GABA Concentration and Gamma Oscillation Frequency in Human Primary Visual Cortex
TLDR
It is shown that individual performance on a visual orientation discrimination task is correlated with both the resting concentration of GABA and the frequency of stimulus-induced gamma oscillations in human visual cortex, and a key role is suggested for GABAergic gamma oscillation frequency in visual discrimination tasks.
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High-frequency brain activity and muscle artifacts in MEG/EEG: a review and recommendations
TLDR
In this review, the spectral, spatial, and temporal characteristics of muscle artifacts are compared with those described (so far) for high-frequency neural activity and several of the techniques that are being developed to help suppress muscle artifacts in MEG/EEG are reviewed.
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Primary motor cortex activation during action observation revealed by wavelet analysis of the EEG
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Increased spontaneous MEG signal diversity for psychoactive doses of ketamine, LSD and psilocybin
TLDR
It is suggested that the sustained occurrence of psychedelic phenomenology constitutes an elevated level of consciousness - as measured by neural signal diversity - asasured by spontaneous magnetoencephalographic signals from humans during altered states of consciousness induced by three psychedelic substances.
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