Hietanen M, Kovala T, Hamalainen A-M.

The authors studied the EEGs of 19 volunteers who were exposed to RF fields. The sources of the fields were 5 different cellular phones (analog and digital models) operating at a frequency of 900 MHz or 1800 MHz. Six 30-minute experiments including one sham exposure were made for each subject. The subjects were unaware of whether the phone was on or off. There was a statistically significant difference in only one of 180 statistical tests done on the data. The authors suggested that this solitary finding was caused by statistical chance and concluded that "the findings of this study suggest that exposure to radiofrequency fields emitted by cellular phones has no abnormal effects on human EEG activity".

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