Scalp electrical recording during paralysis: Quantitative evidence that EEG frequencies above 20Hz are contaminated by EMG

  title={Scalp electrical recording during paralysis: Quantitative evidence that EEG frequencies above 20Hz are contaminated by EMG},
  author={Emma M. Whitham and Kenneth J. Pope and Sean P. Fitzgibbon and Trent W. Lewis and C. Richard Clark and Stephen Loveless and Marita Broberg and Angus Wallace and Dylan DeLosAngeles and Peter Lillie and Andrew Hardy and R. R. L. Fronsko and Alyson Pulbrook and John O. Willoughby},
  journal={Clinical Neurophysiology},

Figures and Tables from this paper

Thinking activates EMG in scalp electrical recordings
Surface Laplacian of Central Scalp Electrical Signals is Insensitive to Muscle Contamination
Scalp surface Laplacian transformations provide robust estimates for detecting high-frequency (gamma) activity, for assessing electrophysiological correlates of disease, and also for providing a measure of brain electrical activity for use as a standard in the development of brain/muscle signal separation methods.
Relation of Gamma Oscillations in Scalp Recordings to Muscular Activity
There were reductions in ‘noisiness’ of the standard scalp recordings which were maximal over the peripheral scalp, not explained by abolition of movement artefact, and best accounted for by sustained EMG activity in resting individuals.
When EMG contamination does not necessarily hide high-frequency EEG: scalp electrical recordings before and after Dysport injections
Investigating effects of partial reductions of electromyogram (EMG) on high-frequency scalp electroencephalogram (EEG) at rest and during performance of certain cognitive tasks demonstrates that though scalp EEGs in the range above 15–40 Hz are contaminated by EMG, in certain experimental situations EMG contamination does not preclude qualitative detections of electroencephalographic correlates of mental activities in β2 and low γ frequency ranges.
Surface Laplacian of scalp electrical signals and independent component analysis resolve EMG contamination of electroencephalogram.
  • S. Fitzgibbon, D. DeLosAngeles, K. Pope
  • Biology
    International journal of psychophysiology : official journal of the International Organization of Psychophysiology
  • 2015
Movement related activity in the high gamma range of the human EEG
Interference of tonic muscle activity on the EEG: a single motor unit study
The need for efficient artifact evaluation methods which can handle muscle interferences is emphasized, as prominent contamination from the activity of only a single MU should indicate the susceptibility of EEG to muscle activity artifacts even under the rest conditions.


EMG contamination of EEG: spectral and topographical characteristics
Persistent abnormality detected in the non-ictal electroencephalogram in primary generalised epilepsy
Increased gamma EEG is probably a marker of the underlying ion channel or neurotransmitter receptor dysfunction in primary generalised epilepsies and may also be a pathophysiological prerequisite for the development of seizures.
Cognitive tasks augment gamma EEG power
Visual stimulation elicits locked and induced gamma oscillations in monkey intracortical- and EEG-potentials, but not in human EEG
It is concluded that visually evoked γ-modulations in humans EEG are not as accessible as in the monkey, and stimulus-relatedγ-Modulation in human subjects contradicts several published findings.
A quantitative study of gamma‐band activity in human intracranial recordings triggered by visual stimuli
It is reported that visual stimulation reliably elicits evoked and induced responses in human intracranial recordings, and new methods adapted to detect the presence of gamma responses at this level of recording are introduced.
Intracerebral recording of cortical activity related to self-paced voluntary movements: a Bereitschaftspotential and event-related desynchronization/synchronization. SEEG study
Substantial differences between BP and ERD in spatial distribution and the widespread topography of ERD/ERS in temporal and higher-order motor regions suggest that oscillatory cortical changes are coupled with cognitive processes supporting movement tasks, such as memory, time interval estimation, and attention.
EEG oscillations at 600 Hz are macroscopic markers for cortical spike bursts
It is shown, in awake monkeys, that a subset of primary somatosensory cortex single units consistently fires both bursts and single spikes phase‐locked to EEG wavelets, proving that this is a natural response mode.
Effects of task difficulty on evoked gamma activity and ERPs in a visual discrimination task
A Functional Gamma-Band Defined by Stimulus-Dependent Synchronization in Area 18 of Awake Behaving Cats
This work investigates stimulus specific synchronization in primary visual cortex of awake cats in a tracking paradigm, and derives a functional γ-band based on an objective criterion that shows that synchronization of neuronal activity is optimally orientation-tuned when a broad frequency band is considered.