Dr. Ferenc Bunta, a communication sciences professor at the University of Houston, said the difference is if you're hearing the audio or listening to it.
Many more claimed they heard one word at one time, then another on a different occasion - appearing to signal it can change depending on your surroundings or sound device.
Audiologist Dr Bill Vass told ABC Canberra it could be like a high-pitched mosquito ringtone school students use, which can usually only be heard by people under 25 years old - making it inaudible to many teachers.
What do you hear?!
Is it "Yanny" or is it "Laurel"?
And you shouldn't be surprised by the confusion, says Dave Sluberski, who is a senior lecturer in the School of Film & Animation at RIT and also a recording engineer with the RPO. Some people who listen to it... He said a friend of his first posted it on Instagram before he put it on Reddit.
I think that the way the word was pronounced or recorded, it just happens to contain all of the frequencies for both words. She said she heard laurel.
More than one person online yearned for that simpler time in 2015, when no one could decide whether the mother of the bride wore white and gold or blue and black. "I think maybe it creates something our brains aren't used to and so we interpret it differently", said Marino. We also now know from recent research that the superior temporal gyrus is extremely important for hearing pitch.
So why do half of us hear one thing and half of us another?