Table 1 Different Authors and techniques used 3.Types of Artifact
Related Figures (4)
Figl: 10-20 electrode placement system The electrical potentials generated by the brain's neural activity can be observed at the scalp using appropriate amplification techniques. The measured signal is called the electroencephalogram (EEG). Electrode placement is the method used to get EEG a 10- 20 system comprises 19 scalp electrodes and 2 ear electrodes as shown in Fig.l. The fluctuations in the waveforms typically cover an amplitude range of 50 ?V, peak to peak. Frequency range lies between the frequency ranges 0 Hz- 100 Hz Fig3: EEG signal containing eye movement artifact 4.2. Eye movement artifacts - The eye movement (EM) artifacts are occurred due to the movement of eye ball during EEG recording. The EM can be occurred several times during | second. And these cannot be eliminated by keeping eyes closed. Similar to EB these are also having higher amplitude than cerebral activities. Wave distribution and brain activity in EEG : Fig2: EEG signal containing eye blink artifact 4.1. Eye blink artifact - The Eye Blink (EB) artifacts are one of the most occurred due to recording. The s prominent types of artifacts. These he blinking of eye during the EEG hort-circuiting effect of the eyelids generates high-amplitude potentials during the EEG recording. Since the frontal channels are only a few centimeters from t strongly to these disturbances. Blin he eyes, the blink potentials propagate EEG channels and can cause major ks attenuate fairly quickly and disturb mostly EEG channels in frontal and central areas. The EB artifacts have higher amplitude compared to the cerebral signals. Therefore it is always difficult to interpret the EEG signal in presence of EB artifacts. The EB artifacts can be minimized in adults by keeping their eyes closed during EEG recording.
