Electrode
placement in EEG recordings follows standardized head measurements to ensure
consistency and accuracy in electrode positioning. The process involves
specific landmarks on the head and precise measurements along the sagittal and
coronal midlines. Here is an overview of electrode placement according to
standardized head measurements:
1. Landmarks:
oNasion: The nasion is
the depression between the forehead and the bridge of the nose.
oInion: The inion is
the bump at the back of the head where the skull meets the neck.
oPreauricular
Points: These points are located above the ears where the ear meets the head.
2. Sagittal and
Coronal Midlines:
o The sagittal
midline is defined by the nasion and inion.
o The coronal
midline is defined by the preauricular points.
3. Incremental
Measurements:
o Measurements are
taken along the sagittal and coronal midlines in increments of 10% and 20%.
o Additional lines
are defined based on these increments to guide electrode placement.
4. Electrode
Positions:
o Electrodes are
placed at specific locations corresponding to the measured percentages along
the midlines.
o Common electrode
positions include Fp1, Fp2, F7, F8, F3, F4, C3, C4, P3, P4, O1, O2, T3, T4, T5,
and T6.
5. Circumferential
Electrodes:
o Additional
electrodes are positioned around the head based on measurements and divisions
along the midlines.
o These
circumferential electrodes provide additional recording sites for comprehensive
EEG data collection.
6. Consistency and
Standardization:
o Standardized head
measurements and electrode placements ensure consistency in EEG recordings
across different individuals and settings.
o By following
these standardized measurements, EEG technicians can accurately position
electrodes for optimal signal acquisition.
By adhering to
these standardized head measurements and electrode placement guidelines, EEG
technicians and clinicians can maintain consistency and accuracy in EEG
recordings, facilitating proper interpretation and analysis of brainwave
activity.
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