This brain augmentation device uses the principles of Transcranial Direct Current Stimulation (tDCS). tDCS is a form of neuron stimulation that uses electricity at low voltages transmitted directly through the brain using skin-contact electrodes.
While originally developed for patients recovering from stroke, scientists at Oxford University started testing tDCS on healthy patients. They found cognitive enhancement in the areas of mathematics, language, memory, coordination, and focus were possible depending on the placement of the electrodes. Interestingly, certain enhancements occurred due to the negative effects of the electricity. The one way flow of Direct Current stimulates one part of the brain while the other part of the brain near the opposite electrode is impeded. Destimulation of certain parts of the brain can limit distraction, allowing the subject to focus and hopefully attain wizard-like abilities.
Retrofitting a Harry Potter wizard hat enhances the legitimacy of tDCS through fashion. A user who dons this cap actually experiences and instant visual "whitening" effect followed by a seemingly prolonged influence on brain abilities. Different types of abilities can be affected by simply rotating and positioning the cap into different orientations on the head. Displayed orientation is ideal for working memory improvement which helps remember spells.