Popular Science - - CHARTED -

When your brain picks up a sig­nal from its sur­round­ings, such as a whiff of french fries, the SUP­PLE­MEN­TARY MO­TOR AREA (SMA) acts as a timer: Its ac­tiv­ity in­creases the longer a stim­u­lus lasts. As long as the ex­ter­nal sig­nal re­mains, neu­rons within the SMA fire, re­tain­ing in­for­ma­tion for other ar­eas of the brain.

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