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In the evaluation of any treatment, it is extremely important to gather information about the long-lasting effects of treatment by collecting follow-up data. Follow-up research aims tomeasure effects of treatment over time to determine if the treatment has resulted in a structural improvement or if clients relapsed to pre-assessment levels. The importance of follow-up data for the evaluation of neurofeedback has been noted repeatedly. Heinrich, Gevensleben, and Strehl (2007), for example, suggest investigation of clinical outcomes, spectral EEG analysis, and neuromodulatory skills using at least a 6-month follow-up interval. Despite many recommendations, the use of follow-up in evaluating neurofeedback as a treatment for several disorders has been used only in a few studies. In
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M. K. C. Nair (2011) studied this question.