To study the effects of exposure to radiofrequency irradiation, emitted by GSM cellular phones, on cognitive functions of humans. The study was a follow-up of previous studies (Eliyahu et al. 2006 and Luria et al. 2009) with a modified exposure set-up (with external antennas away from the body of the subjects to exclude effects of radiofrequency).
29 healthy males (right-handed) were divided into two groups: 1) exposure to the left side of the head (15 subjects) and 2) exposure to the right side of the head (14 subjects). All partcipants performed a spatial working memory task (that required either a left-hand or a right-hand response; three blocks of 50 trials).
|Exposure duration||not specified in the article|
|Distance between exposed object and exposure source||2 m|
|Setup||two mobile phones attached to both sides of the head by a non-conductive frame in a position similiar to normal use; internal antenna positioned 1.5 cm away from the head; to exclude RF signals at the head, the phone's internal antenna was disabled and the signal was transmitted through an external remote antenna which was connected to the phone via a cable; phones silent during the test|
Despite the different exposure setup with external antennas, the data remained similar to those obtained in the previous work (Eliyahu et al. 2006 and Luria et al. 2009): During the first block, the average reaction time of the right-hand responses under left-side exposure showed a trend for longer reaction times relative to the right-side exposure. These results indicate that some of the effects previously attributed to radiofrequency could be the result of some confounders (e.g. non-radiofrequency heating or low frequency magnetic field caused by the battery).