The Influence of Filters on EEG-ERP Testing: Analysis of Motor Cortex in Healthy Subjects

Figures

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  Figure 1. Examples of waveforms. Butterfly plot of somatosensory evoked potentials for all EEG channels (colored lines, 32 channels). The averaged EEG channels are marked in the drawing of the scalp next to the y-axis. Below: Topographical distribution of each component on the scalp. Red and blue indicate the maximum and minimum EEG amplitude at each time point, respectively.

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  Figure 2. The averaged signal for electrodes O1 (green line), Oz (purple line) and O2 (yellow line).

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  Figure 3. Presentation of the average latency values for the F3 and F4 electrodes for the right and left hands for selected filters.

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  Figure 4. Wave amplitude values (V) FIR filter: Top drawing for all and individual fingers: a—all fingers, b—“2” fingers, c—“3” fingers, d—“4” fingers and electrodes P4. Middle drawing for finger 3 and all electrodes. Bottom drawing for finger 4 and all electrodes. Right hand (left in the photo) and left hand (right panel).

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  Figure 5. Latency values (s) FIR filter: Top drawing for all and individual fingers: a—all fingers, b—“2” fingers, c—“3” fingers, d—“4” fingers and electrodes P4. Middle drawing for finger 3 and all electrodes. Bottom drawing for finger 4 and all electrodes. Right hand (left in the photo) and left hand (right panel).

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  Figure 6. Box and whisker plot depicting latency values for averaged values, fingers 2, 3 and 4. From the left: Right hand and left hand.

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  Figure 7. Box and whisker plot depicting amplitude values for averaged values, fingers 2, 3 and 4. From the left: Right hand and left hand.