Thirteen young healthy males were exposed to the GSM signal for 33 minutes. The study, initiated by Centre for Cognitive Neuroscience (CCN) at University of Turku, was methodologically unique combining the expertice in brain imaging (National PET-Center and CCN), measurements and modeling of radiation (Radiation and Nuclear Safety Authority in Finland, STUK) and measurements of skin temperature (Finnish Institute of Occupational Health, TTL).
No conclusions concerning health risks can be made based on the result. The study was financed by Finnish Technology Agency (Tekes) as part of the national Wirecom (wireless communication) research program. The results were published in Journal of Blood Circulation and Metabolism (advance online publication, 14 September 2011).