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1- Department of Medical Physics, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
In neurofeedback training process, previous studies showed that a percentage of 10-50 of subjects are not able to gain control over their own brain activity even after repeated training sessions. This study is conducted to overcome this problem by investigating inter-individual differences in neurofeedback learning in order to propose some predictors for the trainability of subjects. Eight healthy female students took part in eight EEG neurofeedback training sessions for enhancing EEG Gamma power at Oz channel. We studied participants’ pre-existing fluid intelligence and EEG frequency sub-bands’ power during two minutes eyes-closed rest and a cognitive task as psychological and neurophysiological factors, in relation to neurofeedback learning performance. We also assessed self-reports of participants about mental strategies used by them during neurofeedback to identify the most effective successful strategies. The results revealed that significant percentage of individuals (25% in this study) are not able to learn how to control their brain Gamma activity using neurofeedback. Our findings suggest that IQ, Gamma power during cognitive task, and Alpha power at rest can predict Gamma-enhancing neurofeedback performance of individuals. Due to our study, neurofeedback learning is a form of implicit learning. We also found that learning without user’s mental efforts to find out successful mental strategies, in other words unconscious learning, lead to more success in Gamma-enhancing neurofeedback. Our results may improve Gamma neurofeedback efficacy for further clinical usage and studies through giving insight about both non-trainable individuals and effective mental strategies.
Type of Study: Original | Subject: Clinical Neuroscience
Received: 2019/05/27 | Accepted: 2019/10/2 | Published: 2018/03/15

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