Another case of perceptual ambiguity gone viral, along the lines of the famous blue dress/gold dress phenomenon.
I emphatically hear “Yanny”, but roughly half of the population hears “Laurel”.
The New York Times explains:
The Times traced the clip back to Roland Szabo, an 18-year-old high school student in Lawrenceville, Ga., who posts as RolandCamry on Reddit. He said Wednesday that he was working on a school project and recorded the voice from a vocabulary website playing through the speakers on his computer. People in the room disagreed about what they were hearing. Some other students created an Instagram poll, which was then shared widely on Reddit, Twitter and other sites.
One detail may frustrate some and vindicate others: He found the original clip on the vocabulary.com page for “laurel,” the word for a wreath worn on the head, “usually a symbol of victory.”
The Times also provides a tool that allows you to modify the frequency response, transforming “Yanny” into “Laurel” and back again: