The use of a 'phantom scalp' to assess the possible direct pickup of mobile phone handset emissions by electroencephalogram electrode leads.
A 'Phantom Scalp' was constructed from a conducting foam mat to form a layer under a 62-electrode electroencephalogram cap closely approximating the electrical properties of a human scalp. The mat was placed over a polystyrene manikin head to preserve a correct anatomical arrangement. Electrical signals were recorded with a Global System for Mobile (GSM) communications mobile phone handset in place against the side of the 'head'. Amplitude spectra were compared for three phone conditions: 'off', 'standby' and 'transmit'. At 217 Hz, significant differences were obtained between 'transmit' and the other two conditions, but no significant differences were noted for the physiologically important range 0.5-30 Hz. An anomalous difference was noted for one electrode in the range 30-45 Hz.
Wood
A W
AW
School of Biophysical Sciences and Electrical Engineering, Swinburne University of Technology, Melbourne, Australia. awood@swin.edu.au
Hamblin
D L
DL
Croft
R J
RJ
D040421:Cell Phone; D004566:Electrodes; D004569:Electroencephalography / Q000528:radiation effects*; D004574:Electromagnetic Fields; D006801:Humans; D008954:Models, Biological; D012535:Scalp