Cell Phone Signals Excite Brain
Cell phone emissions excite the part of the brain cortex nearest to the phone, but it is not clear if these effects are harmful, Italian researchers reported. Their study, published in the Annals of Neurology, adds to a growing body of research about mobile phones, their possible effects on the brain, and whether there is a link to cancer.
About 730 million cell phones are expected to be sold this year, according to industry estimates, and nearly two billion people around the world already use them. Of these, more than 500 million use a type that emits electromagnetic field known as Global System for Mobile communications or GSM radio phones.
Their possible effects on the brain are controversial and not well understood. Dr Paolo Rossini of Fatebenefratelli hospital in Milan and colleagues used Transcranial Magnetic Stimulation or TMS to check brain function while people used these phones.
They had 15 young male volunteers use a GSM 900 cell phone for 45 minutes. In 12 of the 15, the cells in the motor cortex adjacent to the cell phone showed excitability during phone use but returned to normal within an hour. The cortex is the outside layer of the brain and the motor cortex is known as the “excitable area” because magnetic stimulation has been shown to cause a muscle twitch.
The researchers stressed that they had not shown that using a cell phone is bad for the brain in any way, but people with conditions such as epilepsy, linked with brain cell excitability, could potentially be affected.