Kumlin T, Iivonen H, Miettinen P, Juvonen A, et al. (2007):
Kumlin et al. exposed Wistar rats for 2 hours a day, 5 days a
week, from age 3 to 8 weeks, to RFR at 900 MHz frequency (similar
to that from a GSM phone). The whole body average SAR was 0.3 or
3 W/kg. There were 24 rats in each of 3 groups - sham, low, or
high exposure. Six rats in each group were perfused for immunohistology
to determine possible changes in brain morphology, while the remaining
18 went through a battery of behavioral tests over 4 weeks. These
tests were an open-field test for locomotor and exploratory behaviour,
plus maze for anxiety, pre-pulse inhibition of the acoustic startle
reflex test to test general reactivity and attention, and Morris
water maze test for spatial learning and memory.
The only behavioural test to show a significant difference between
RF- and sham-exposed groups was the Morris water maze test. In
this the RF-exposed groups had improved learning and memory.
There were no degenerative changes, dying neurons, or effects
on the leakage of the blood-brain barrier.