Aalto S, Haarala C, Bruck A, Sipila H, et al. (2006)

The authors had previously reported that exposure to electromagnetic fields from a commercial cell phone had no effect on regional cerebral blood flow (rCBF).

On this occasion they conducted an experiment with an improved study design. The confounding effects of audible noise from the phone were eliminated by using a silent external power source. They used a double-blind, counterbalanced study comparing RFR exposure to a sham exposure. Twelve volunteers performed a simple memory task during the exposure, and rCBF was measured by positron emission tomography (PET) scanning. The RFR exposure was from a commercial cell phone at a frequency of 902 MHz with a mean power of 0.25 W pulsed at a frequency of 217 Hz and a pulse width of 0.557 ms. The SAR was 0.743 W/kg with a peak value calculated at 1.51 W/kg.

The authors observed a local decrease in rCBF beneath the antenna in the inferior temporal cortex and an increase more distantly in the prefrontal cortex. They postulated that the increased rCBF was due to changes in neuronal activity induced by electromagnetic fields. There were no changes in reaction time or response accuracy. The authors caution that replication studies with a larger sample are warranted.

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