What are the most common types of artifacts you find while processing EEG signals?
The most common artifacts in EEG recordings are eye blinks and eye movements. Changes in the resting potential of the retina during eye-blinks and eye-movements as well as muscle activities of the eyelid during blinks produces disturbances in EEG recordings.
What are three sources of artifacts in EEG recordings?
What are the 3 sources of artifact? Recording equipment, the patient, and the environment.
What is a myogenic artifact in EEG?
Myogenic artifact comes from muscle movements, and is most commonly found in the frontal or lateral temporal regions, due to the frontalis and temporalis muscles. It is marked by high frequency, often low amplitude activity overlying the normal cerebral rhythms, and is usually most prominent in the awake state.
How do you identify an EEG artifact?
The most common way to identify the artifacts in Fp1-Fp2 ,f7-F8 is to register the EOG. The signals in frontal elctrodes usually sinchronous with vertical eyes movements(same polarity), f7-f8- with horizontal movements(opposite polarity).
What are electrode artifacts?
The most common electrode artifact is the electrode popping. Morphologically this appears as single or multiple sharp waveforms due to abrupt impedance change.
What are artifacts in EEG signals?
These artifacts can contaminate the quality of EEG data. In this regard, a comprehensive knowledge of the types of artifacts is requisite to remove the artifacts or noise efficiently. Artifacts are unwanted signals which are mainly originated from environment noise, experimental error and physiological artifacts.
What are EMG artifacts?
Particular patterns of electromyogram (EMG) artifacts can occur in some movement disorders. Essential tremor and Parkinson disease can produce rhythmic 4- to 6-Hz sinusoidal artifacts that may mimic cerebral activity. Another disorder that can produce repetitive muscle artifacts is hemifacial spasm.