Visual Processing and the Visual Cortex

Рет қаралды 263,851

Күн бұрын

We learned about the structure of the eye in the Anatomy and Physiology series. But how do we process visual information? Light hits the retina at the back of the eye, and then what happens? Well quite a lot, to be honest! We have to go deeper regarding retinal structure, neural pathways to the brain, and the regions of the brain that receive and process this information, which are collectively referred to as the visual cortex. So let's get a closer look!
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Пікірлер: 115

@TH6NAM6L6SSv3 3 жыл бұрын

Bruh, I read the section in my textbook on this about 15 times, and it just didnt click. You sir, are a gentleman and scholar.

@unboxer2487 2 жыл бұрын

Honestly speaking, this is the best video for vision explanation I have seen so far. Detailed, short, talking slowly and writing the key points. Perfect for teaching . Thanks professor Dave.

@deanwidiani3244 5 ай бұрын

(2)!!! agreed. it helps a lot!

@monisshathiagu2971 2 жыл бұрын

[10:17] Just a tweak: glutamate is an excitatory neurotransmitter, and this is not an exception in the eye. The way it inhibits signal transduction, rather, is by stimulating the release of GABA in horizontal cells, which is an inhibitory neurotransmitter.

@wrldrcrds6946 2 жыл бұрын

Thank youu soo much. I got cofused at that part of the video.

@nonamefound9296 2 жыл бұрын

Heeey thank you so much I was getting confused

@joneriksen9257 2 жыл бұрын

@@nonamefound9296 Thanks. I was confused

@HarryNicNicholas 2 жыл бұрын

do you know what form information about light takes in order for the brain to create an image? how does the electr-chemical signal contain information? i hope this is clear.

@kadri246 2 жыл бұрын

Is this the reason why light therapy is a treatment?

@voidofmisery4810 3 жыл бұрын

I am learning this in college now, and you made this subject so much easier to understand!!! Thank you so much! I am so grateful for this!

@jamesh6441 4 жыл бұрын

You the TRUTH Prof. Dave! I truly appreciate everything you do on here!

@mariesellers953 2 жыл бұрын

I remember when I was taking Gen Chem 4 years ago, your videos helped me understand things so well. Now that I'm taking upper neuroscience courses, you're STILL pulling through. You're a God sent!!

@KamauriKing-ii5ke 8 ай бұрын

His shoulders needed to hide there is an alphabet

@knoz35 2 жыл бұрын

In university it took 40 hours to complete all this. and you just made it possible to understand in 16 minutes. just wow. amazing!!

@centsury 4 жыл бұрын

You’re really helping me getting through midterms! Thank you so much! Can’t wait for more videos on this subject.

@fredericomarques4230 23 күн бұрын

Great job Professor, a really complete session about vision and all its path!! Congrats!

@RockerProf Жыл бұрын

Fantastic video. Your visual graphics very well done and helpful.Thank you for making this. It helps me understand much better how musicians process sight reading musical notes.

@mitsunori222000 4 жыл бұрын

Just what I've been waiting for. Thanks.

@LiftersClinic 2 жыл бұрын

Excellent review of the intersections topics that unite cell biology to organism.

@emat731 3 жыл бұрын

This was very informative and helpful, thank you!

@jean-antoinenorbert1346 4 жыл бұрын

Really great content and presentation!

@mahekmamgain1008 3 жыл бұрын

Sir your videos are literally great and they are really helping me in college.. ❤️❤️❤️❤️

@hypothesised4453 2 жыл бұрын

thank you for this v concise explanation of the three weeks of class content i missed while i was ill! :,)

@CamronWiltshire 3 жыл бұрын

Great video! Thanks Professor Dave!

@marianbundel1229 Жыл бұрын

Simply amazing. Thank you very much Dave!!!!

@lordpredator8855 4 жыл бұрын

Hello Professor Dave. I am admiring the work that you do, I want to suggest a topic for a future video. Can you please explain, how does fermentation and mould work. Thank you

@ErisvaldoJunior 4 жыл бұрын

Thanks a lot from Brazil!

@Zetsuke4 4 жыл бұрын

Very well explained Professor Dave.

@roksanadawil 3 жыл бұрын

Thank you so much, that helped me a lot :) I learnt more about how does the visual system in our minds work :)

@MG-oi2zy 7 ай бұрын

Excellent explainations!

@NikhilSharma-td3hr 2 жыл бұрын

Fantastic Sir. Respect from India.

@isaiasyoyo 2 жыл бұрын

Helpful video. detailed, thank you.

@agnesetretjakova5405 3 жыл бұрын

Thanks for great explanation! 🙏

@suffragettefashion 4 ай бұрын

❤ this was fantastic! I’m an artist seeking greater understanding of how our eyes process light.

@ArleighLauren Жыл бұрын

I am a visual learner so my textbook was so hard to comprehend! This video was amazinggg

@pratikdeshmukh241 4 жыл бұрын

Nicely explain

@wa8642 Жыл бұрын

Im speechless. This is too good

@ahababkhan6803 3 жыл бұрын

Thank you so much for special lacture ❤️ keep it up please

@itzikovadia851 2 жыл бұрын

Amazing video thank you

@goodnessnwanebu8662 9 ай бұрын

You’re the man, brother 💪

@mohammaddaraeim.d4649 3 жыл бұрын

thanks prof dave

@nikoscharalampidis7153 2 жыл бұрын

Amazing stuff!

@ophthojooeileyecirclehisha4917 Жыл бұрын

thank you so much professor

@eugenelenskih2885 8 ай бұрын

Very good very informative.

@user-fq7tt6yc6t 2 жыл бұрын

This was amazing.

@Dr_mae7733 Жыл бұрын

Really Great Video

@chudiergonywiel5587 7 ай бұрын

Great explain, I will be professor one day like you.

@sowsudh 2 жыл бұрын

You mentioned about the axons converging in the optic nerve to create a 'disruption' that in turn creates a blind spot. Could you please help elaborate on that?

@pooyarazzaghi388 2 жыл бұрын

Very nice! thanks

@snoogumsboogums28 Жыл бұрын

this is is such a good video

@chaimareader6091 4 жыл бұрын

Hi Professor Dave, Can you help please. I want to change the wavelength of the Bragg mirror according to random distribution But i don't have any idia about the mathimaticals formula used to discribed this variation.

@palomabrt Жыл бұрын

This video is amazing

@BunnyLang 2 жыл бұрын

Thank you.

@AsiaUmarMasud-je3ii 11 ай бұрын

Please can talk about the Synaptic organisation of the retina

@needexotics8447 4 ай бұрын

wow thank you so much❤

@lolk7726 2 жыл бұрын

great video

@Keana43 Жыл бұрын

i totally get it now thanks

@mollystringer3722 3 жыл бұрын

So this is all good and well (thank you so much oh my god, it was so helpful) but the on and off ganglion cells and how they work kind of broke my brain, so maybe make a video on those as well? Or if anyone has already made a video on those, I desperately need to be pointed in that direction.

@DANGJOS 3 жыл бұрын

Amazing!

@arkitchen2231 2 жыл бұрын

What kinds of visual information reach the pons, and why this connection may aid in coordination, balance, and movement?

@sakunwanmosika6073 2 жыл бұрын

Thanks

@shalinig2739 Жыл бұрын

Beautiful

@Minimum1337 Жыл бұрын

THANK YOU!!!!!

@joelsteiger4439 2 жыл бұрын

thankyou so much! +1 psychology-student-life saved

@pavirajapaksha7276 Жыл бұрын

best ever explanation 🥰🥰🥰🥰🥰🥰🥰🥰

@windigo000 2 жыл бұрын

so many cortex wow 😁👍

@shreyasimhadri3863 2 жыл бұрын

professor Dave you are a blessing and I thank you on the night before my biological psychology exam.

@TheVeryHungrySingularity 4 жыл бұрын

What determines which wavelength of light a particular cone is activated by? Hypothetically, could they be altered to see into IR or UV wavelengths?

@iliakorvigo7341 4 жыл бұрын

> What determines which wavelength of light a particular cone is activated by The absorption spectrum of its visual pigment. > Hypothetically, could they be altered to see into IR or UV wavelengths Hypothetically, yes, though the problem is not as much about finding a suitable pigment, as it is about passing through and focusing IR or UV light. Basically, different types (wavelength ranges) of EM radiation require different materials and focusing systems. For example, liquid water is transparent for visible EM radiation, but opaque for UV and IR radiation.

@TheAceLewis 3 жыл бұрын

Do you think biological enhancements or cybernetic enhancements will be leading the charge in correcting or upgrading human vision in the future?

@MKUltraTutorials 4 жыл бұрын

Excellent video tons of information Thank you. Question: do you believe we can heal our vision with proper nutrition? Or you still believe that glasses are the only way?

@ProfessorDaveExplains 4 жыл бұрын

well if by heal you mean improve inborn visual deficits, i don't know enough to say definitively, but i would imagine that diet can't really have any effect. on the other hand in terms of maintaining eye health and normal vision as you age, i have heard there is a link with certain nutrients and that sounds pretty reasonable.

@HarryNicNicholas 2 жыл бұрын

@@ProfessorDaveExplains 8:00 sorry, but this is misleading. i know everyone does this - i've only seen one video on the subject - but cones don't detect colour - there is no colour in objects or light, colour exists - is created - only in the image making part of the brain. cones detect energy levels of photons, not colour. i came to this video because i am not clear how any information gets to the brain, that is, electro-chemical signals tell the brain about taste, smell, light, but how exactly is that information conveyed / encoded? it can't be digital (i imagine), and there certainly aren't tubes of paint snaking around the eye. i believe neurons work by transferring ionisation of sodium . potassium / chlorine, but how is the INFORMATION , the colour, the taste, encoded? and please do a video explaining that objects and light have no colour, this is a big misconception that the vast majority of people can't get their heads around - i'm tired of arguing with people on this. thanks!!

@knufyeinundzwanzig2004 Жыл бұрын

@@HarryNicNicholas Why do you think the information can‘t be binary? As far as I know the output of neurons is binary, signal or no signal.

@kadri246 2 жыл бұрын

My go-to-guy to pass my exams... Thanks for the videos.

@kbieberlove101 3 ай бұрын

professor dave needs his name on my degree

@pfc-5503 Жыл бұрын

why are your images and explanations better than my professors who went to Harvard?

@ChappalMarungi Ай бұрын

Your profs went to Harvard?

@pfc-5503 Ай бұрын

⁠@@ChappalMarungi the one that taught neurology did

@mohamedghonaim6598 Жыл бұрын

Great ❤

@TheWheelBry Жыл бұрын

Watching this made my eyes hurt😅 but it was very helpful, thank you!

@ralcool5932 3 ай бұрын

I would like to postulate that a photon is a node, a wave interaction point.

@liuliumama Жыл бұрын

exelent！

@tarq2126 3 жыл бұрын

Thank so match. Sorry. if tha retenal found in yodopseen toogther rodopseen. Or what?? Can help me.

@Mrbluesplayer43 3 жыл бұрын

Visionary!

@cl7934 3 жыл бұрын

GOLD

@marcoss6212 8 ай бұрын

Thank you for this informative video, Bravo!, but I have a curious question, now I have a basic understanding how we process visual information, my question is this, has anybody ever determined how fast visual process take before we know what we are looking at? Maybe crazy for me to try to find an alternative to the notion that nothing travels faster than light, I know, I'm crazy :).

@Misslayer99 5 ай бұрын

About .15 seconds but varies depending on individual's cognitive processing and image complexity

@marcoss6212 5 ай бұрын

@@Misslayer99 Thank you.

@shalinig2739 Жыл бұрын

9:26 visual transduction

@khalifalkhatatbeh 11 ай бұрын

Can retinal cones regenerate like cells?

@younginsane90 3 жыл бұрын

How can I Destimulate my Visual Cortex ?

@dianat2002 Жыл бұрын

How did the color cones "evolve" to work only in the visible spectrum range. The eye would provide no way for the animal to see during the "evolution" process if say the photoreceptors were working in the Microwave range. Your video is good Dave but there is way more to explain if you want us to buy into your evolution idea. It appears from an engineering perspective that the eye had to be designed to work in the visible spectrum from the beginning. I noticed you left out the motion sensing circuits in the retina that wire to the Superior colliculus and then to the Tectospinal tract to create our visual reflexes, like when a ball is coming at your head. The eye does much more than just compress vision.

@transcendentphilosophy 11 ай бұрын

Just remember, these explanations don't resolve the hard problem of consciousness!

@mieczyslawherba2723 Жыл бұрын

Five senses are mentioned, only four named.

@CAMIDRCS 2 ай бұрын

Why are the ganglions facing the light?🤔 It should have been the cones & rodes right?!!!!

@amehak1922 4 жыл бұрын

Is there anything you don't know about?

@turanbirligi6969 5 ай бұрын

But how actually vision creating in the brain what is brain actually doing

@user-iy5db2ic2x 6 ай бұрын

Intergrated census.

@jmo8a_veda Жыл бұрын

Sometimes bright lights getin the house it makes me so mad. Esp when Im reading

@TK-mv6sq Жыл бұрын

Lit!

@achrafabouras2118 2 жыл бұрын

i wish i was smart

@simonmoore8776 Жыл бұрын

There are more than five senses! A professor should know better!

@googleyoutubechannel8554 Жыл бұрын

Wait, wtf, is this as far as neuroscience has gotten? How does object detection work? Forget obj det. how does the brain parse visual info into pre-object subunits (eg maybe lines) How does the brain parse shadows etc to build 3d inference? This explains basically nothing.

@transcendentphilosophy 11 ай бұрын

Calm down, its a short video. Can't explain everything in one video.

@ayadali9112 4 жыл бұрын

First!

@HarryNicNicholas 2 жыл бұрын

8:00 sorry, but this is misleading. i know everyone does this - i've only seen one video on the subject - but cones don't detect colour - there is no colour is objects or light, colour exists - is created - only in the image making part of the brain. i came to this video because i am not clear how any information gets to the brain, that is, electro-chemical signals tell the brain about taste, smell, light, but how exactly is that information conveyed / encoded? it can't be digital (i imagine), and there certainly aren't tubes of paint snaking around the eye. i believe neurons work by transferring ionisation of sodium . potassium / chlorine, but how is the INFORMATION , the colour, the taste, encoded? and please do a video explaining that objects and light have no colour, this is a big misconception that the vast majority of people can't get their heads around - i'm tired of arguing with people on this.

@daniel9973 Жыл бұрын

I believe you are referring to the hard problem of consciousness.

@knufyeinundzwanzig2004 Жыл бұрын

Why did you comment this more than once?

@jmo8a_veda Жыл бұрын

Dam they let you post photos of eyes like that... Is this even legal..idk. sorry.