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Examples of possible artifact sources. (A) EMG bursts, presenting with irregular morphology and variations in amplitude and frequency inside the burst. (B) Oscillations resulting from spike filtering: note that, compared to the genuine fast oscillations, they are brief in duration, with a single sharp central component with higher amplitude. Left part: unfiltered EEG (LF: 0.3 Hz, HF:70 Hz); right part: outlined sections, expanded in time and high-pass filtered at 40 Hz.
