Browsing by Author "Krause, Christina M"
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- ItemEffects of electromagnetic field emitted by cellular phones on the EEG during an auditory memory task: a double blind replication study.(2003-12-29) Krause, Christina M; Haarala, Christian; Sillanmäki, Lauri; Koivisto, Mika; Alanko, Katarina; Revonsuo, Antti; Laine, Matti; Hämäläinen, HeikkiThe effects of electromagnetic fields EMF emitted by cellular phones on the event related desynchronization synchronization ERD ERS of the 4 6 6 8 8 10 and 10 12 Hz electroencephalogram EEG frequency bands were studied in 24 normal subjects performing an auditory memory task This study was a systematic replication of our previous work In the present double blind study all subjects performed the memory task both with and without exposure to a digital 902 MHz field in a counterbalanced order We were not able to replicate the findings from our earlier study All eight of the significant changes in our earlier study were not significant in the present double blind replication Also the effect of EMF on the number of incorrect answers in the memory task was inconsistent We previously reported no significant effect of EMF exposure on the number of incorrect answers in the memory task but a significant increase in errors was observed in the present study We conclude that EMF effects on the EEG and on the performance on memory tasks may be variable and not easily replicable for unknown reasons
- ItemEffects of pulsed and continuous wave 902 MHz mobile phone exposure on brain oscillatory activity during cognitive processing.(2007-04-30) Krause, Christina M; Pesonen, Mirka; Haarala Björnberg, Christian; Hämäläinen, HeikkiThe aim of the current double blind studies was to partially replicate the studies by Krause et al 2000ab 2004 and to further investigate the possible effects of electromagnetic fields EMF emitted by mobile phones MP on the event related desynchronisation synchronisation ERD ERS EEG electroencephalogram responses during cognitive processing Two groups both consisting of 36 male participants were recruited One group performed an auditory memory task and the other performed a visual working memory task in six exposure conditions SHAM no EMF CW continuous wave EMF and PM pulse modulated EMF during both left and right side exposure while the EEG was recorded In line with our previous studies we observed that the exposure to EMF had modest effects on brain oscillatory responses in the alpha frequency range approximately 8 12 Hz and had no effects on the behavioural measures The effects on the EEG were however varying unsystematic and inconsistent with previous reports We conclude that the effects of EMF on brain oscillatory responses may be subtle variable and difficult to replicate for unknown reasons
- ItemMobile phone effects on children's event-related oscillatory EEG during an auditory memory task.(2006-07-18) Krause, Christina M; Björnberg, Christian Haarala; Pesonen, Mirka; Hulten, Annika; Liesivuori, Tiia; Koivisto, Mika; Revonsuo, Antti; Laine, Matti; Hämäläinen, HeikkiTo assess the effects of electromagnetic fields EMF emitted by mobile phones MP on the 1 20 Hz event related brain oscillatory EEG electroencephalogram responses in children performing an auditory memory task encoding and recognition