Browsing by Author "Aalto, Sargo"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
- ItemEffects of a 902 MHz mobile phone on cerebral blood flow in humans: a PET study.(2003-11-05) Haarala, Christian; Aalto, Sargo; Hautzel, Hubertus; Julkunen, Laura; Rinne, Juha O; Laine, Matti; Krause, Bernd; Hämäläinen, HeikkiFourteen healthy right handed subjects were scanned using PET with a 15O water tracer during exposure to electromagnetic field EMF emitted by a mobile phone and a sham exposure under double blind conditions During scanning the subjects performed a visual working memory task Exposure to an active mobile phone produced a relative decrease in regional cerebral blood flow rCBF bilaterally in the auditory cortex but no rCBF changes were observed in the area of maximum EMF It is possible that these remote findings were caused by the EMF emitted by the active mobile phone A more likely interpretation of the present findings were a result of an auditory signal from the active mobile phone Therefore it is not reasoned to attribute this finding to the EMF emitted by the phone Further study on human rCBF during exposure to EMF of a mobile phone is needed
- ItemMobile phone affects cerebral blood flow in humans.(2006-06-22) Aalto, Sargo; Haarala, Christian; Brück, Anna; Sipilä, Hannu; Hämäläinen, Heikki; Rinne, Juha OMobile 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