Eg neuromyst
"Roi Cohen Kadosh and his team at the University of Oxford recruited 72 students for a bold experiment. They asked participants to wear a cap fitted with electrodes and then sent mild, painless electrical currents over specific brain areas tied to learning. Some participants only got a placebo as a control. Then, over five days, everyone completed math challenges involving both calculation (figuring things out) and memorization (repeating learned answers).
Before any zapping began, the researchers scanned the students’ brains. They were particularly interested in the connection between two areas: the dorsolateral prefrontal cortex (for learning new stuff) and the posterior parietal cortex (for recalling it). Stronger links between these two regions meant better baseline math skills.
Students with weaker brain connections who received stimulation over their prefrontal cortex made the biggest gains: a striking 25–29% improvement. They caught up to, or even surpassed, their ‘naturally gifted’ peers.
…The science behind it involves a concept called stochastic resonance. Essentially, a little noise actually helps a weak signal to stand out… carefully calibrated noise stimulation might enhance cognitive function by making weak neural signals more detectable. Essentially, in the brain, that means nudging sluggish neurons so they’re more likely to fire when needed. And this could especially help people whose brains aren’t wired for fast math learning."
note: ALWAYS note positive study bias especially in tDCS papers