Huber R, Treyer V, Borbely AA, Schuderer J, et al. (2002):

These authors have previously studied the effect of RF radiation on EEG tracings. The present studies used a similar design. Sixteen healthy young males were exposed to 30 minutes of RF radiation at 900 MHz (spatial peak SAR 1.0 W/kg), or sham-exposed. A crossover design was used, so that each participant had both the active and the sham exposure. Neither the subjects nor the experimenters were aware of the exposure condition. The exposure took place at 22.20 hrs and EEG recordings made for 8 hrs. As with their 2000 study, the authors found increased power in non-REM sleep in the 12.25-13.35 Hz range. On this occasion they carried out the tests with both pulse-modulated (pm) and continuous-wave (cw) EMF exposure, and found that the EEG changes were only seen with pm exposure.

An experiment was also done to assess cerebral blood flow. EMF exposure was carried out as above, but between 08.00 and 14.00 hours. The blood flow was assessed by positron emission tomography (PET) scans. Thirteen subjects completed this experiment. There was an increase in blood flow in the dorsolateral prefrontal cortex of the left hemisphere (the same side as the EMF exposure), when compared to sham exposure. As with the EEG study, the blood flow increase was only seen with pm and not with cw exposure.

The authors point out that the region of the brain where they observed the increased blood flow plays a major role in working memory. They suggest that this may be an explanation for the changes in cognitive function observed by some researchers (see Human Experiments - Cognitive function).

Since the pulse-modulation uses frequencies at 2, 8, 217, 1736 Hz and higher, the authors cannot say if one or a mixture of frequencies produced the changes.

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