An Artefact is something that shows up on EKG and is non cerebral in origin. This is the first example of a knitting artefact:
"One hypothesis might be that the wool being knitted by the patient causes a build up of static electricity either on the knitting needles or on the wool itself. During the transfer of the stitch from one needle to the other, the tapping of the needles together may cause the release of this static electricity and allow it be recorded on the EEG."
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