Electrical signals used to stimulate the brain may improve learning and other functions, but could also adversely affect cognitive thinking, according to a study. The experiment looked at how transcranial electrical stimulation -- which has been showed to double a person's learning speed -- affected a person's ability to automatically perform tasks. Those who received TES showed signs of learning faster, but also failed at automatically performing tasks. "It's a proof of concept to show there might be a cognitive cost to TES," said Roi Cohen Kadosh, who conducted the experiments.

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