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The significance of most findings on EEG biofeedback is limited by study design flaws that include small study sizes, heterogeneous populations, absence of a control (ie, sham biofeedback) group, inconsistent outcome measures, self-selection bias (the majority of enrolled subjects were highly motivated to receive treatment), and limited or no long-term follow-up
Soyal et al
T.StangenbergS.ChenH.Al-OdatI.ChanY
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