Preattentive auditory information processing under exposure to the 902 MHz GSM mobile phone electromagnetic field: a mismatch negativity (MMN) study.

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2009-03-02
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Previous studies on the effects of the mobile phone electromagnetic field EMF on various event related potential ERP components have yielded inconsistent and even contradictory results and often failed in replication The mismatch negativity MMN is an auditory ERP component elicited by infrequent deviant stimuli differing in some physical features from the repetitive frequent standard stimuli in a sound sequence The MMN provides a sensitive measure for cortical auditory stimulus feature discrimination regardless of attention and other contaminating factors In this study MMN responses to duration intensity frequency and gap changes were recorded in healthy young adults n 17 using a multifeature paradigm including several types of auditory change in the same stimulus sequence while a GSM mobile phone was placed on either ear with the EMF 902 MHz pulsed at 217 Hz SAR 1g 1 14 W kg SAR 10g 0 82 W kg peak value 1 21 W kg measured with an SAM phantom on or off An MMN was elicited by all deviant types while its amplitude and latency showed no significant differences due to EMF exposure for any deviant types In the present study we found no conclusive evidence that acute exposure to GSM mobile phone EMF affects cortical auditory change detection processing reflected by the MMN
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