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Precisely timed electrical stimulation to the left side of the brain can reliably and significantly enhance learning and memory performance by as much as 15 per cent, according to a study. "We developed a system to monitor brain activity and trigger stimulation responsively based on the subject's brain activity," said Youssef Ezzyat, a senior data scientist at University of Pennsylvania in the US. "We also identified a novel target for applying stimulation, the left lateral temporal cortex," said Ezzyat.