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People are claiming that they can hear a thudding sound when the pylon hits the ground and the picture vibrates.
The gif was created by @IamHappyToast in 2008, but is now surfacing as internet users call it an "optical illusion for the ears".

Dr Lisa DeBruine from the Institute of Neuroscience and Psychology at the University of Glasgow asked her Twitter followers to describe the sensation they experience when viewing the gif. She received over 240,000 responses.

One person who suffers from ringing ears replied: "I hear a vibrating thudding sound, and it also cuts out my tinnitus during the camera shake." Others offered explanations as to why.

While another suggested it may have something to do with correlated neuronal activity: "The brain is 'expecting/predicting' what is coming visually and then fires a version of what it expects across the relevant senses. Also explains why some might 'feel' a physical shake."

"My gut says the camera shake is responsible for the entire effect. Anything that shook the camera like that, would probably make the 'thud' sound," posted another Twitter user.

@IamHappyToast further explained his gif...

"I suspect the noisy gif phenomenon is closely related to what we call the Visually-Evoked Auditory Response or vEAR for short," explained Fassnidge.

"This is the ability of some people to hear moving objects even though they don't make a sound, which may be a subtle form of synaesthesia - the triggering of one sense by another.

"We are constantly surrounded by movements that make a sound, whether they are footsteps as people walk, lip movements while they talk, a ball bouncing in the playground, or the crash as we drop a glass. There is some evidence to suggest that synaesthetic pairings are, to some extent, learnt during infancy.

"I might assume I am hearing the footsteps of a person walking on the other side of the street when really the sound exists only in my mind.

"So this may be a common phenomenon because the sound makes sense, but for that exact reason, we may not even know we have this unusual ability until the noisy gif suddenly came along in the last few years.

"What determines who experiences vEAR and how intensely is probably individual differences in how our brain is wired."

Here's the gif... what sensation do you experience?

Source: BBC

This article first appeared on 947 : Why are people able to hear this gif?

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