Participants were fitted with the EEG recording apparatus and seated in a comfortable chair 1.5 m in front of a computermonitor.
A mobile phone was mounted over the temporal region (right or left side for half of the particpants) comparable to normal use (in ''touch'' position; FCC 2001 guidelines) using a plastic cradle-like apparatus. The handset's audio circuitry was disabled to avoid acoustic cues about the status of the phone. Additionally, padding was placed between the handset and its leather casing to silence buzzing sounds coming from the circuitry and to insulate against heat generated by the battery.
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A first 21-min experimental period of sham exposure was followed, after 10 min of resting, by another 21-min period of exposure or sham exposure. A double-blind, pseudorandom, counterbalanced, crossover design was employed where subjects attended two sessions 1 week apart.
SAR measurements were conducted inside an anthromorphic mannequin (SAM) phantom using a precision robot RF Dosimetric Assessment System (DASY4). The average SAR value was measured over 10 g of tissue in-line with the phone's antenna over the temporal lobe. The power output of the test phone was measured using a power meter at the phone's antenna before the experiments, after the 60th participant, and in the end.