This Video Will Hurt.

CGP Grey

Education

4.9 • 820 Ratings

🗓️ 23 December 2013

⏱️ 7 minutes

🔗️ Recording | iTunes | RSS

🧾️ Download transcript

Summary

Hypersounds breaking your brain. Sorry.

Official Discussion on http://www.reddit.com/r/CGPGrey/comments/1tjaj4/the_video_will_hurt_grey_explains/

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Special Thanks to:

http://www.youtube.com/user/TotalPhilosophy/

Saylor Fielder

Julian Yap

Ardalan Moazeni

Dr Clifton K. Meader http://goo.gl/DpsuGk

Dr Fabrizio Benedetti

Max Ramsay - @maxafax, The Soden Family, Conan Kudo (ニール・ゴンパ), Kira Lanier, Lisa Marie Terry, Dave Roberts (the Best Dad ever), mikey.reiach.net, Carine Frsch, Mauceri76, David Benko, Team Fluger, A.Manning, Smuffie00, Robert English, @jwvdiermen, Laura Saura Maura Watiker, Nicholas Hartikainen, M Go Blue!, @chrisaiello, @Bad1z, Kuffer Sam

Selected sources:

http://bjp.rcpsych.org/content/180/4/300.full

211.144.68.84:9998/91keshi/Public/File/39/16-11/pdf/nm.2229.pdf

http://www.bmj.com/content/332/7546/886?view=long&pmid=16520326

http://www.ncbi.nlm.nih.gov/pubmed/22336767

http://www.researchgate.net/publication/40819426_Nocebo-induced_hyperalgesia_during_local_anesthetic_injection/file/72e7e5203d9229e4c5.pdf

http://www.sciencedirect.com/science/article/pii/S0022399912003352

http://jama.jamanetwork.com/data/Journals/JAMA/4983/JOC50054.pdf

http://ses.library.usyd.edu.au/handle/2123/8977

http://www.bmj.com/content/339/bmj.b5613

http://www.ncbi.nlm.nih.gov/m/pubmed/21627976/

http://www.nejm.org/doi/full/10.1056/NEJM200001133420206

Transcript

Click on a timestamp to play from that location

0:00.0	Please, put on your headphones.
0:02.0	I promise there won't be any loud sounds, but this video is going to hurt.
0:06.0	There's a study about hypersounds and how they cause headaches.
0:09.0	These sounds are too high pitch to hear, like the one added to this video, playing right now,
0:14.0	but cause headaches they still do.
0:16.0	The hypersound in your headphones is pressing on your inner ear,
0:20.0	stressing the nerves leading
0:20.9	to your brain where, if the headache hasn't started already, it soon will, as exposure
0:25.9	causes headaches after only 10 seconds.
0:28.7	Oh my.
0:29.6	Can you feel it?
0:30.6	That pressure in your ears spreading to your now throbbing brain?
0:33.7	Because you shouldn't.
0:34.9	This study is made up, and there's no hypersound in the audio, but some of you will still
0:38.8	have begun to feel a headache.
0:40.6	Why?
0:41.6	The nocebo effect.
0:42.6	A nocebo is a harmless thing, like a video with non-existent hypersounds that causes harm,
0:47.2	like a headache, because you believe it's harmful.
0:49.8	That sounds like voodoo, but there's real science behind the nocebo effect, which is more
0:53.8	than an irritating parlor trick.
0:55.5	It causes real problems, like in medicine.
	...

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