Browsing by Author "Shestakova, Anna"
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- ItemNo effects of mobile phone use on cortical auditory change-detection in children: an ERP study.(2010-03-15) Kwon, Myoung Soo; Huotilainen, Minna; Shestakova, Anna; Kujala, Teija; Näätänen, Risto; Hämäläinen, HeikkiWe investigated the effect of mobile phone use on the auditory sensory memory in children Auditory event related potentials ERPs P1 N2 mismatch negativity MMN and P3a were recorded from 17 children aged 11 12 years in the recently developed multi feature paradigm This paradigm allows one to determine the neural change detection profile consisting of several different types of acoustic changes During the recording an ordinary GSM Global System for Mobile Communications mobile phone emitting 902 MHz pulsed at 217 Hz electromagnetic field EMF was placed on the ear over the left or right temporal area SAR 1g 1 14 W kg SAR 10g 0 82 W kg peak value 1 21 W kg The EMF was either on or off in a single blind manner We found that a short exposure two 6 min blocks for each side to mobile phone EMF has no statistically significant effects on the neural change detection profile measured with the MMN Furthermore the multi feature paradigm was shown to be well suited for studies of perception accuracy and sensory memory in children However it should be noted that the present study only had sufficient statistical power to detect a large effect size
- ItemPreattentive auditory information processing under exposure to the 902 MHz GSM mobile phone electromagnetic field: a mismatch negativity (MMN) study.(2009-03-02) Kwon, Myoung Soo; Kujala, Teija; Huotilainen, Minna; Shestakova, Anna; Näätänen, Risto; Hämäläinen, HeikkiPrevious 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