Next stop in our tour of your sensory systems? VISION. With a little help from an optical illusion, we take a look inside your eyes to try to figure out how your sense of vision works — and how it can be tricked.
Pssst… we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!
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Chapters:
Introduction: Optical Illusions 00:00
How Does Light Work? 1:31
Structure of the Eye 2:31
Layers of the Eye: Fibrous, Vascular, and Inner Layers 3:33
The Retina 4:56
Rods and Cones 6:07
How do Optical Illusions Work? 7:15
Review 8:33
Credits 9:14
***
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One video at a time…
I saw the flag
Only for 1-2secs
But l did
I'll just sit here while you google it hahaha
3:31 why in hell did I google it …
0:42 replayed the thing 11 times and nope I aint seen no after image
Am I ok
Oh wait I don't care
xD
your pronunciation very much reminds me of Zapp Brannigan (i think i misspelled his name soz)
Ishould have never searched Globe Luxation
The reason you saw the flag is because of adaptation..
Who is watching this for school
the content is so well structured, but it's a shame that every single pause is edited out. I find it quite stressful to watch because there is not a tenth of a second between sentences. In addition why is he speaking so fast?
Pssst… we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!
Download it here for Apple Devices: https://apple.co/3d4eyZo
Download it here for Android Devices: https://bit.ly/2SrDulJ
Hank: "Don't Google Globe Luxation"
Me: Immediately googles it,
Freaks out,
Goes back to Video.
Globe luxation > clear tape
I feel like I can pop my eyes out during a stressful toilet visit
Cone Error: Cones not responding.
Look a bright white thing to continue
Hank: Tells us to not look up Globe Luxation
Me: Stress levels increasing
Subtitles???
Who else is binge watching the entire series?
i am confused with the part of the flag. How can we still se the blue colour in the flag when the shades are different.
why did i google it? im scared for life now
Thank you so much. If I may use some parts of this video for educational purpose ..
Does eyes have pain receptors?
i'm regretting why i googled it.
God is so complex!!!!! by the way you are the king of the nerds! memorizing whole books, Jesus Christ!!!! you never stop talking not even to take a breath.
DO NOT GOOGLE IT I BEG OF YOU
also, just an FYI the photoreceptors don't directly connect to the bipolar cells, same with how the ganglion cells connect to the bipolar cells. There's another layer of amacrine cells and horizontal cells that allows the information from the photoreceptors to converge onto the ganglion cells. It should look like this, ganglion cells –> amacrine cells –> bipolar cells –> horizontal cells –> photoreceptors
maybe someone else can confirm, but I don't think the explanation for afterimages is correct. In order to explain the phenomenon of afterimages you'd need to introduce the idea of colour opponency. From what i've learned, prolonged exposure to a certain colour (like red), will cause bleaching of the photo pigment. Then looking at a neutral surface (like white) will cause a rebound effect, where the ganglion cell fires below base rate causing you to perceive the opposite colour (hence, green)
Not seeing anything on white screen. I have been staying that turquoise flag for a while now
Thank u crash course, I learn from u all the time , u are really helping me through this time
I sort of saw a phantom image of the flag although I looked away from it. So weird of our eyes can be easily fooled. I enjoy these videos so much.
iridocyclitis: an inflammation of the iris and cyclitry bodies
B52
2:38
3:38
B53
0:54
1:41
5:42
6:12
7:40
how does he talk soo fast like does he breathe
I always thought invisible light leaves the eye, bounces off the object, returns and the brain tells you what you're seeing. I can't find that no where on the web. Darn it
WHY AM I NOT SUBSCIBED!!??!!!??!!!!?!!
Mindblown 🤯
Fun fact: my professor used your video as part of the class~
To all my homies who trusted Uncle Hank & didn't google globe luxation…
1:19 hve guys noticed the background??🤫
Your explanation is perfect ,but you talk too fast 🤕
"I'll just sit here while you google it" ahah
3:29 I googled it and I should have listened to you
Hank:You really do not wanna goggle it
Me:* Immediately goggles it and cry’s because of the images*
Hank:I will just wait for you to goggle it
Me:*still crying*
Even in 2020, this video is still helpful.