GIF is one of the formats of the image. In this format, one can watch the video of few seconds without the audio.  But one bizarre GIF which was created by a Twitter User named @IamHappyToast has resurfaced on the internet and is now viral as some people are claiming that they can hear a thud sound every time the pylons skip. Dr Lisa DeBruine, a psychology researcher at the Glasgow University tweeted the image and asked them whether they could hear the thud noise or no.

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Even though gif has no audio many said that they heard the sound each time the animated version pylon landed on the surface. The tweet has left many people confused. The Twitter poll which was conducted by her was answered by 295,000 people. And the results showed that 69% of them did hear the sound and around 20% said they hear “nothing”.

here is the tweet that included that GIF

 Many claimed that the sound is of our own heartbeats that we listen when the GIF plays but the same was dismissed by DeBruine. She tweeted: For the dozens of people who’ve suggested it’s just your heartbeat: Typical adult resting heart rate is 60-100 bmp. This gif is about 50bmp, so I wouldn’t expect so many people to experience it if it required synchronization with your heartbeat. Others offered their explanations as to why as well.

One of the users said: “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,” tweeted another.

So how this auditory illusion works? Right now on the internet, there is a theory which is getting popular. The theory suggests that the sound is the result of McGurk effect or synesthesia. As per Live Science website, the effect happens when your brain is tricked to hear a sound that matches to what you watching. This is a rare neurological condition. In this condition, our senses blend in such way that one sense triggers another. Another theory which is now popular is of squinting of ears. As per studies, our brain closes our ears whenever we expect the loud noise. What are your views on this? Can you the thud as well? Let us know in the comments below.