Certain people can hear particular animated gifs despite them containing no audio information, and scientists have some leads on what might cause this seemingly impossible phenomenon.
The gif mentioned in the video:
https://twitter.com/LisaDeBruine/status/937105553968566272
Hosted by: Hank Green
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Sources:
https://www.smithsonianmag.com/smart-news/why-some-people-hear-silent-gifs-180968537/
https://twitter.com/lisadebruine/status/937302328184594432
https://www.sciencedirect.com/science/article/pii/S1053810016303336?via%3Dihub
https://link.springer.com/article/10.3758%2FBF03202611
https://www.sciencedirect.com/science/article/pii/S0010945218300741
https://www.ncbi.nlm.nih.gov/pubmed/16269367
https://digest.bps.org.uk/2013/10/28/when-orgasm-triggers-a-light-show-the-first-ever-study-of-synaesthetic-sex/
https://www.audiology.org/news/notes-acoustic-middle-ear-reflex
https://vula.uct.ac.za/access/content/group/27b5cb1b-1b65-4280-9437-a9898ddd4c40/Acoustic%20_stapedius_%20reflexes.pdf
http://www.cochlea.org/en/hearing/ear
https://www.sciencedirect.com/science/article/pii/B9780444626301000184
https://www.mitpressjournals.org/doi/abs/10.1162/jocn_a_01395
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