Electrical noise from devices artifacts in EEG recordings can arise from various electrical devices present in the environment.
1. Description:
oSource: Electrical
devices with electric motors can produce high-amplitude irregular activity
resembling spikes, polyspikes, or muscle potentials due to the switching
electromagnetic fields within the motor.
oCharacteristics: The artifact is
associated with the activity of the device and may exhibit a fixed recurrence
pattern according to the device's settings.
2. Characteristics:
oWaveform: The artifact
from electrical devices may have diphasic and triphasic potentials, recurring
with a nearly fixed interval and minimal change in waveform.
oAmplitude: It can be lower
in amplitude compared to other types of artifacts, such as muscle artifact, and
may co-occur with typical muscle artifact in the same location.
3. Identification:
oRecurrence
Pattern: The
fixed recurrence pattern of electrical noise artifacts, based on the device's
settings, can aid in distinguishing them from physiological or pathological
patterns.
oAssociation: Observing for a
temporal association between the device's activity and the appearance of
irregular activity in the EEG can help confirm the presence of electrical noise
artifacts.
Understanding the
characteristics and patterns of electrical noise from devices artifacts is
essential for differentiating them from brain-generated activity or other types
of artifacts in EEG recordings. Proper identification and differentiation of
these artifacts contribute to the accurate interpretation of EEG data and help
ensure the quality and reliability of EEG analysis in clinical practice and
research.
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