The neurotechnology is called transcranial direct current stimulation, or tDCS for short. At its simplest, the method involves a device that uses little more than a 9-volt battery and some electrodes ...

Matt Herich uses a tDCS device that was made by another student he met on Reddit. Four 9-volt batteries and sticky self-adhesive electrodes are connected by a circuit board that sends a constant ...

And sales of the devices spike at fairly regular times, says Robin Azzam, CEO of a leading tDCS retailer Caputron: around college midterms and finals. Caputron also helps point customers to academic ...