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Photo 1: The perceived lowest periodicity is shown as a dotted line, named as "greatest common divisor." The audible effect of a phantom fundamental strikes most often when combining a fundamental and its fifth.

You might recall that funny test in 2018, which invited (and divided) listeners to see which name they heard in a clip. Let's explore phantom frequencies.

"Yanny or Laurel" was the name of a famous auditory illusion that came up in 2018. An auditory illusion is the equivalent of an optical illusion, where the listener hears something that is either not there or even technically impossible, due to a false perception or bias.

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