Mobile phone affects cerebral blood flow in humans.
Mobile phones create a radio-frequency electromagnetic field (EMF) around them when in use, the effects of which on brain physiology in humans are not well known. We studied the effects of a commercial mobile phone on regional cerebral blood flow (rCBF) in healthy humans using positron emission tomography (PET) imaging. Positron emission tomography data was acquired using a double-blind, counterbalanced study design with 12 male subjects performing a computer-controlled verbal working memory task (letter 1-back). Explorative and objective voxel-based statistical analysis revealed that a mobile phone in operation induces a local decrease in rCBF beneath the antenna in the inferior temporal cortex and an increase more distantly in the prefrontal cortex. Our results provide the first evidence, suggesting that the EMF emitted by a commercial mobile phone affects rCBF in humans. These results are consistent with the postulation that EMF induces changes in neuronal activity.
Turku PET Centre, University of Turku, Turku, Finland. sargo.aalto@utu.fi
Sargo
S
Aalto
Christian
C
Haarala
Anna
A
Brück
Hannu
H
Sipilä
Heikki
H
Hämäläinen
Juha O
JO
Rinne
D000328:Adult; D001921:Brain / Q000098:blood supply* / Q000000981:diagnostic imaging / Q000528:radiation effects*; D040421:Cell Phone; D002560:Cerebrovascular Circulation / Q000528:radiation effects*; D004311:Double-Blind Method; D004574:Electromagnetic Fields / Q000009:adverse effects*; D006801:Humans; D008297:Male; D008570:Memory, Short-Term / Q000528:radiation effects; D009474:Neurons / Q000378:metabolism / Q000528:radiation effects; D049268:Positron-Emission Tomography / Q000379:methods; D011930:Reaction Time / Q000528:radiation effects; D012016:Reference Values; D012680:Sensitivity and Specificity