Figure 1. Neurofeedback commonly makes use of two technologies to obtain information about brain function. Electroencephalography (EEG, left) uses electrodes placed on the scalp to detect electrical impulses produced by neurons residing in the outermost layer of the brain, the cortex. Functional Magnetic Resonance Imaging (fMRI, right) measures how much blood flow each region of the brain receives; here, blood flow indicates which regions of the brain are most active.
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