Table 9 Various artefacts in EEG signal recording
From: Mental state and emotion detection from musically stimulated EEG
Category | Artefact /Source(Cause)/Frequency/Amplitude Morphology | Artefact Prevention |
|---|---|---|
Physiological Artefacts | Cardiac/Heart/\(\le\)1Hz/1-10mV /Epilepsy | Selection of proper montage Monitoring during recording Offline visual inspection Low pass filter (LPF) Data Rejection |
EOG/Eye/0.5-3 Hz/100mV /Tumour, delta wave | Artefact-free recording protocol Online monitoring Offline visual inspection Low pass filter (LPF) Using various Transform (ICA, PCA, EOG subtraction) | |
Muscle Artefact/Muscle /\(\ge\) 100Hz/low /Beta frequency | Artefact-free recording protocol Online Monitoring Offline visual inspection High pass filter(HPF) Data rejection | |
Physical movement artefact /Physical movement /Very low/ very high /Morphology different from actual EEG | Artefact-free recording protocol Online monitoring Offline visual inspection Data rejection | |
External Artefacts | Transmission line /Transmission line 50–60 Hz/low/ Morphology different from actual EEG | Notch filter DC power supply |
Phone artefacts /Mobile and landline phone /high/high/different | Artefact-free recording protocol | |
Electrode artefact /Electrode and sweating /very low/high | Artefact-free recording protocol LPF | |
Impedance artefact /Electrode with impedance>5K\(\Omega\) /-/approximately 100 μV/different |  |