Why sham feedback fails as a placebo
by David A Kaiser, MFA, PhD
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In a recent study, truthful feedback is compared with false feedback using MRI and DTI analysis (Ghaziri et al., 2013). After 40 sessions of EEG training, both forms of feedback were found to increase gray matter volume in the brain, but veridical feedback produces twice as much new gray matter for select brain areas. Accurate feedback also increases white matter volume, strengthening connections between brain areas, while false feedback revealed no impact on connections in this study.
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