An exposure to mobile phones not less than 50 minutes showed changes in brain cell activity nearer to the part where it is kept closer to the antenna of the mobile.

US. National Institute of Health(NIH) conducted the study and further said that the harm caused by the mobile is not clear and it does not settle any conclusion of any link for brain cancer formation.

Dr. Nora Volkow of the NIH who conducted the study said that they have seen the alteration in the glucose metabolism(a sign of brain activity) when the brain is exposed to mobile phone radiation and added that the changes had taken place in the place where it is kept closer to the mobile antenna.

The study results were published in the journal of the American Medical Association(JAMA)

The study was intended to see the reaction of the brain to electromagnetic waves caused by wireless phone signals.

Volkow said that their study shed light on the changes that had taken place in the brain by exposure to electromagnetic waves by mobiles and however it shed any light on the link of radiation and cancer.

She said “human brain is sensitive to electromagnetic radiation from mobile phone exposure.”

Volkow and her team studied 47 people on whom brain scan taken with the mobile phone exposure for 50 minutes and others were taken brain scans with the mobile phones kept at switched off.

They found that there was 7 per cent increase in brain metabolism in the region closest to the phone antenna when the phone was on.