Published:  2014

Long-term Effects of Placebo-controlled Prefrontal Eeg-neurofeedback Training in Healthy Subjects

Authors:  H. Engelbregt, D. Keeser, E. Suiker, S. Karch, J. B. Deijen, O. Pogarell


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IntroductionIn this study we evaluated long-term effects of frontal beta EEG-neurofeedback training (E-NFT) in healthy subjects. We hypothesized that E-NFT can change frontal beta activity and that changes in frontal beta EEG activity are accompanied by altered cognitive performance changes.Methods19 healthy women and 6 healthy men participated in this study. The subjects were randomly adjusted to a real E-NFT or a placebo E-NFT. EEG was recorded by means of a Deymed Truscan 32-channel system with 19 channels before E-NFT (t1), post to the training sessions (t2) and 3- years after E-NFT (t3). For E-NFT an average of respectively 14.3 and 13.2 training sessions were completed for experimental and control group. Each trainingsession took approximately 45 minutes; training-protocol: increase 12-18 Hz at Fz-electrode, auditory and visual feedback was given if EEG activity was increased at Fz for at least 1second.ResultsCompared to the sham E-NFT, which was used for the control group, real E-NFT increased beta activity in a predictable way (postmeasurement1 after NFB training, t2, post-measurement after 3years, t3). However, regarding our sample of healthy subjects E-NFT did not result in significantly improved cognitive performance.DiscussionThe main finding of the present study was an increase in cortical frontal beta activity after E-NFT. We also found evidence of a long-term effect on the basis of a follow-up measurement after three years. Based on our results we conclude that EEG-NFT can selectively change EEG beta activity, in the short and long term.