Replication study fails to confirm phone effect on brain function
There have been several studies that have suggested that exposure to RF radiation from cell phones may enhance cognitive function. The authors of one of these studies have attempted to replicate it (Koivisto et al., 2000a), but with improved methodology. They included double blind testing, larger sample size, multicentre testing, and additional tests. In the present study they found that the electromagnetic field had no effect on cognitive functioning. For more, see "Research - Clinical Experiments- cognitive function".
Reference: Haarala C, Bjornberg L, Ek M, Laine M, et al. (2003): Effect of 902 MHz electromagnetic field emitted by mobile phones on human cognitive function: A replication study. Bioelectromagnetics 24:283-288.
Some research has suggested that RF radiation from cell phones can disrupt animal behaviour and cognitive function. Other research, however, has shown no effect. In a recent study, in which rats learned how to find food in a maze, there was no effect on the animals' performance unless they were exposed at high SAR levels, sufficient to elevate body temperature. For more, see "Research - Toxicological Experiments - brain function".
Reference: Yamaguchi H, Tsurita G, Ueno S, Watanabe S, et al (2003): 1439 MHz pulsed TDMA fields affect performance of rats in a T-maze task only when body temperature is elevated. Bioelectromagnetics 24:223-230.
Bortkiewicz A, Pilacik B, Gadzicka E, Szymczak W (2002): The excretion
of 6-hydroxymelatonin sulfate in healthy young men exposed to electromagnetic
fields emitted by cellular phone - an experimental study. Neuroendocrinology
Letters 23 (suppl 1):88-91.
The Mobile Telecommunications and Health Research (MTHR) Programme in the UK has announced that it will fund additional projects. One will investigate the risk of early childhood cancers, in particular leukaemia and non-Hodgkin's lymphoma, among the population residing near mobile phone base stations. A case-control approach will be used.
Another study will examine whether mobile phone signals cause symptoms such as headaches, nausea, dizziness and fatigue. It will also investigate whether the signals affect the levels of certain hormones that are important in regulating metabolism. "Hypersensitive" people who often experience symptoms when using a mobile phone will be compared to a group who do not experience any symptoms.