Human sniffs last between one and three seconds. During that time, chemicals enter the nose and allow us to perceive the smells around us. But whether humans can perceive odor changes shorter than the length of one sniff has been an open question.
A new device that allows for precise odor control shows that people perceive much more detail within a single sniff than previously thought. They can perceive odor changes in fractions of a second, researchers report October 14 in Nature Human Behaviour.
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