A multiwire cable for recording from moving subjects

Abstract

One of the main sources of artefacts when recording biological potential changes in moving subjects is the electrostatic charge over the insulation of the wires connecting the subject with the recording apparatus. Particularly in highly insulating plastic coating a charge of hundreds of volts may build up. Any movement of the insulating coating may evoke capacitively a change of potential which may be large in relation to the biological potential changes. This effect may be prevented to a large degree by the use of coaxial screened cable. In multichannel electroencephalography, however; an interconnecting cable made up of these coaxial cables may be too cumbersome.