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Related Experiment Video

Updated: May 28, 2026

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
06:46

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

The saccadic spike artifact in MEG.

Christine Carl1, Alper Açık, Peter König

  • 1Department of Neurophysiology and Pathophysiology, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany. c.carl@uke.de

Neuroimage
|October 4, 2011
PubMed
Summary
This summary is machine-generated.

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The saccadic spike field (SF) in magnetoencephalography (MEG) is a non-neural artifact originating from eye muscles. This study characterizes the SF, revealing its amplitude and direction dependency, aiding in distinguishing it from genuine brain activity.

Area of Science:

  • Neuroscience
  • Biophysics
  • Signal Processing

Background:

  • Electro- and magnetoencephalography (EEG/MEG) non-invasively measure human brain activity.
  • Non-neural artifacts, like the saccadic spike potential (SP) in EEG, can confound EEG/MEG data.
  • The corresponding artifact in MEG, the saccadic spike field (SF), remains poorly characterized.

Purpose of the Study:

  • To provide a detailed characterization of the saccadic spike field (SF) in magnetoencephalography (MEG).
  • To compare the SF in MEG with the well-established saccadic spike potential (SP) in electroencephalography (EEG).
  • To identify the sources of the SF artifact.

Main Methods:

  • Simultaneous recording of MEG, EEG, gaze position, and electrooculogram (EOG).
  • Comparison of SF in MEG across different saccade sizes and directions.

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Last Updated: May 28, 2026

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
06:46

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

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Recording Horizontal Saccade Performances Accurately in Neurological Patients Using Electro-oculogram

Published on: March 13, 2018

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  • Distributed source analysis to identify artifact origins.

    • Main Results:

    • The SF in MEG is a saccade amplitude and direction-dependent, lateralized artifact.
    • The SF artifact is most prominent in the gamma frequency range and strongest at frontal and temporal sensors.
    • Unlike the SP in EEG, the SF did not contaminate parietal sensors.
    • Sources of the SF were identified in the extraocular muscles.

    Conclusions:

    • The SF in MEG mimics neuronal activity in frontal and temporal sensors.
    • This characterization provides a basis for identifying and mitigating saccadic spike contamination in MEG studies.
    • Understanding SF is crucial for accurate interpretation of neural dynamics derived from MEG data.