Pulsed and continuous wave mobile phone exposure over left versus right hemisphere: effects on human cognitive function.
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Date
2007-04-30
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Abstract
The possible effects of continuous wave CW and pulse modulated PM electromagnetic field EMF on human cognition was studied in 36 healthy male subjects They performed cognitive tasks while exposed to CW PM and sham EMF The subjects performed the same tasks twice during each session once with left sided and once with right sided exposure The EMF conditions were spread across three testing sessions each session separated by 1 week The exposed hemisphere EMF condition and test order were counterbalanced over all subjects We employed a double blind design both the subject and the experimenter were unaware of the EMF condition The EMF was created with a signal generator connected via amplifier to a dummy phone antenna creating a power output distribution similar to the original commercial mobile phone The EMF had either a continuous power output of 0 25 W CW or pulsed power output with a mean of 0 25 W An additional control group of 16 healthy male volunteers performed the same tasks without any exposure equipment to see if mere presence of the equipment could have affected the subjects performance No effects were found between the different EMF conditions separate hemisphere exposures or between the control and experimental group In conclusion the current results indicate that normal mobile phones have no discernible effect on human cognitive function as measured by behavioral tests