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  Indian J Med Microbiol
 

Figure 7: Sample electroencephalogram signals recorded when the participant was looking at a 13 Hz visual stimulus. A digital 0.5 Hz Butterworth high-pass filter is applied to remove DC offset. The large 50-Hz peak due to a nearby power line connected noise source is recognizable for the wet electrodes

Figure 7: Sample electroencephalogram signals recorded when the participant was looking at a 13 Hz visual stimulus. A digital 0.5 Hz Butterworth high-pass filter is applied to remove DC offset. The large 50-Hz peak due to a nearby power line connected noise source is recognizable for the wet electrodes