Efficacy of Electroencephalography (EEG) Neurofeedback (NF) for the Treatment of Anxiety Disorder

The aim of this study is to assess the efficacy of electroencephalography (EEG) neurofeedback (NF) as an Add-on Treatment for the Anxiety disorder. Meanwhile, evaluate the effect of EEG-NF on cognitive function of Anxiety patients. Furthermore, the investigators will examine the changes in cortisol, gut microbiome and some biomarkers. The hypothesis of this study is that EEG-NF alleviate the anxiety symptoms and improve the cognitive function of Anxiety disorder patients with regulating attention response.