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Timing is everything: How the brain links memories of sequential events

Suppose you heard the sound of skidding tires, followed by a car crash. The next time you heard such a skid, you might cringe in fear, expecting a crash to follow -- suggesting that somehow, your brain had linked those two memories so that a fairly innocuous sound provokes dread. Scientists have now discovered how two neural circuits in the brain work together to control the formation of such time-linked memories.
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