Israeli scientists have found the strongest evidence yet that people can learn new information while they are sleeping, rather than simply strengthening memories already made. Anat Arzi from the Weizmann Institute of Science in Rehovot, Israel played tones to sleeping volunteers before wafting smells of deodorant, shampoo, rotten fish, or dead animals past their noses. The smells triggered a sniffing reflex and the pleasant ones drew stronger sniffs.
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