Visual Processing and the Visual Cortex

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  • เผยแพร่เมื่อ 20 ก.ค. 2024
  • 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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ความคิดเห็น • 117

  • @TH6NAM6L6SSv3
    @TH6NAM6L6SSv3 3 ปีที่แล้ว +102

    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
    @unboxer2487 2 ปีที่แล้ว +95

    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
      @deanwidiani3244 7 หลายเดือนก่อน

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

  • @monisshathiagu2971
    @monisshathiagu2971 3 ปีที่แล้ว +133

    [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
      @wrldrcrds6946 2 ปีที่แล้ว +12

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

    • @nonamefound9296
      @nonamefound9296 2 ปีที่แล้ว +2

      Heeey thank you so much I was getting confused

    • @joneriksen9257
      @joneriksen9257 2 ปีที่แล้ว +1

      @@nonamefound9296 Thanks. I was confused

    • @HarryNicNicholas
      @HarryNicNicholas 2 ปีที่แล้ว

      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
      @kadri246 2 ปีที่แล้ว

      Is this the reason why light therapy is a treatment?

  • @voidofmisery4810
    @voidofmisery4810 3 ปีที่แล้ว +16

    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
    @jamesh6441 4 ปีที่แล้ว +18

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

  • @mariesellers953
    @mariesellers953 2 ปีที่แล้ว +27

    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
      @KamauriKing-ii5ke 9 หลายเดือนก่อน

      His shoulders needed to hide there is an alphabet

  • @centsury
    @centsury 4 ปีที่แล้ว +41

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

  • @knoz35
    @knoz35 2 ปีที่แล้ว +2

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

  • @lordpredator8855
    @lordpredator8855 4 ปีที่แล้ว +6

    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

  • @RockerProf
    @RockerProf ปีที่แล้ว

    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.

  • @emat731
    @emat731 3 ปีที่แล้ว +1

    This was very informative and helpful, thank you!

  • @mitsunori222000
    @mitsunori222000 4 ปีที่แล้ว +2

    Just what I've been waiting for. Thanks.

  • @fredericomarques4230
    @fredericomarques4230 2 หลายเดือนก่อน

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

  • @hypothesised4453
    @hypothesised4453 2 ปีที่แล้ว +1

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

  • @LiftersClinic
    @LiftersClinic 2 ปีที่แล้ว

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

  • @jean-antoinenorbert1346
    @jean-antoinenorbert1346 4 ปีที่แล้ว +1

    Really great content and presentation!

  • @marianbundel1229
    @marianbundel1229 ปีที่แล้ว

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

  • @roksanadawil
    @roksanadawil 3 ปีที่แล้ว +1

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

  • @Zetsuke4
    @Zetsuke4 4 ปีที่แล้ว +6

    Very well explained Professor Dave.

  • @CamronWiltshire
    @CamronWiltshire 3 ปีที่แล้ว

    Great video! Thanks Professor Dave!

  • @mahekmamgain1008
    @mahekmamgain1008 3 ปีที่แล้ว

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

  • @sowsudh
    @sowsudh 2 ปีที่แล้ว

    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?

  • @agnesetretjakova5405
    @agnesetretjakova5405 3 ปีที่แล้ว

    Thanks for great explanation! 🙏

  • @isaiasyoyo
    @isaiasyoyo 2 ปีที่แล้ว

    Helpful video. detailed, thank you.

  • @ErisvaldoJunior
    @ErisvaldoJunior 4 ปีที่แล้ว +1

    Thanks a lot from Brazil!

  • @ahababkhan6803
    @ahababkhan6803 3 ปีที่แล้ว

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

  • @chaimareader6091
    @chaimareader6091 4 ปีที่แล้ว +1

    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.

  • @arkitchen2231
    @arkitchen2231 2 ปีที่แล้ว +1

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

  • @MG-oi2zy
    @MG-oi2zy 9 หลายเดือนก่อน

    Excellent explainations!

  • @ArleighLauren
    @ArleighLauren ปีที่แล้ว

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

  • @suffragettefashion
    @suffragettefashion 5 หลายเดือนก่อน

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

  • @wa8642
    @wa8642 ปีที่แล้ว

    Im speechless. This is too good

  • @mollystringer3722
    @mollystringer3722 3 ปีที่แล้ว

    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.

  • @pratikdeshmukh241
    @pratikdeshmukh241 4 ปีที่แล้ว +1

    Nicely explain

  • @itzikovadia851
    @itzikovadia851 2 ปีที่แล้ว

    Amazing video thank you

  • @NikhilSharma-td3hr
    @NikhilSharma-td3hr 3 ปีที่แล้ว

    Fantastic Sir. Respect from India.

  • @TheVeryHungrySingularity
    @TheVeryHungrySingularity 4 ปีที่แล้ว +2

    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
      @iliakorvigo7341 4 ปีที่แล้ว +4

      > 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.

  • @nikoscharalampidis7153
    @nikoscharalampidis7153 2 ปีที่แล้ว

    Amazing stuff!

  • @mohammaddaraeim.d4649
    @mohammaddaraeim.d4649 3 ปีที่แล้ว

    thanks prof dave

  • @goodnessnwanebu8662
    @goodnessnwanebu8662 11 หลายเดือนก่อน

    You’re the man, brother 💪

  • @AsiaUmarMasud-je3ii
    @AsiaUmarMasud-je3ii ปีที่แล้ว

    Please can talk about the Synaptic organisation of the retina

  • @user-fq7tt6yc6t
    @user-fq7tt6yc6t 2 ปีที่แล้ว

    This was amazing.

  • @ophthojooeileyecirclehisha4917
    @ophthojooeileyecirclehisha4917 ปีที่แล้ว

    thank you so much professor

  • @chudiergonywiel5587
    @chudiergonywiel5587 8 หลายเดือนก่อน

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

  • @eugenelenskih2885
    @eugenelenskih2885 10 หลายเดือนก่อน

    Very good very informative.

  • @snoogumsboogums28
    @snoogumsboogums28 ปีที่แล้ว

    this is is such a good video

  • @TheAceLewis
    @TheAceLewis 4 ปีที่แล้ว +1

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

  • @pooyarazzaghi388
    @pooyarazzaghi388 2 ปีที่แล้ว

    Very nice! thanks

  • @tarq2126
    @tarq2126 3 ปีที่แล้ว

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

  • @palomabrt
    @palomabrt ปีที่แล้ว

    This video is amazing

  • @Mathkhury
    @Mathkhury ปีที่แล้ว

    Really Great Video

  • @BunnyLang
    @BunnyLang 2 ปีที่แล้ว

    Thank you.

  • @Keana43
    @Keana43 ปีที่แล้ว

    i totally get it now thanks

  • @DANGJOS
    @DANGJOS 3 ปีที่แล้ว

    Amazing!

  • @younginsane90
    @younginsane90 3 ปีที่แล้ว

    How can I Destimulate my Visual Cortex ?

  • @MKUltraTutorials
    @MKUltraTutorials 4 ปีที่แล้ว +2

    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
      @ProfessorDaveExplains  4 ปีที่แล้ว +6

      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
      @HarryNicNicholas 2 ปีที่แล้ว

      @@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
      @knufyeinundzwanzig2004 2 ปีที่แล้ว

      @@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.

  • @needexotics8447
    @needexotics8447 6 หลายเดือนก่อน

    wow thank you so much❤

  • @lolk7726
    @lolk7726 2 ปีที่แล้ว

    great video

  • @joelsteiger4439
    @joelsteiger4439 2 ปีที่แล้ว

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

  • @shreyasimhadri3863
    @shreyasimhadri3863 2 ปีที่แล้ว

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

  • @Minimum1337
    @Minimum1337 ปีที่แล้ว

    THANK YOU!!!!!

  • @shalinig2739
    @shalinig2739 ปีที่แล้ว

    Beautiful

  • @sakunwanmosika6073
    @sakunwanmosika6073 2 ปีที่แล้ว

    Thanks

  • @kadri246
    @kadri246 2 ปีที่แล้ว

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

  • @kbieberlove101
    @kbieberlove101 4 หลายเดือนก่อน

    professor dave needs his name on my degree

  • @pavirajapaksha7276
    @pavirajapaksha7276 ปีที่แล้ว

    best ever explanation 🥰🥰🥰🥰🥰🥰🥰🥰

  • @windigo000
    @windigo000 2 ปีที่แล้ว

    so many cortex wow 😁👍

  • @mieczyslawherba2723
    @mieczyslawherba2723 ปีที่แล้ว +1

    Five senses are mentioned, only four named.

  • @ghofran_20118
    @ghofran_20118 ปีที่แล้ว

    Can retinal cones regenerate like cells?

  • @cl7934
    @cl7934 3 ปีที่แล้ว

    GOLD

  • @mohamedghonaim6598
    @mohamedghonaim6598 ปีที่แล้ว

    Great ❤

  • @TheWheelBry
    @TheWheelBry ปีที่แล้ว

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

  • @ralcool5932
    @ralcool5932 5 หลายเดือนก่อน

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

  • @Mrbluesplayer43
    @Mrbluesplayer43 3 ปีที่แล้ว

    Visionary!

  • @marcoss6212
    @marcoss6212 9 หลายเดือนก่อน

    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
      @Misslayer99 7 หลายเดือนก่อน +2

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

    • @marcoss6212
      @marcoss6212 7 หลายเดือนก่อน +1

      @@Misslayer99 Thank you.

  • @CAMIDRCS
    @CAMIDRCS 4 หลายเดือนก่อน +1

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

  • @liuliumama
    @liuliumama ปีที่แล้ว

    exelent!

  • @pfc-5503
    @pfc-5503 ปีที่แล้ว +1

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

    • @ChappalMarungi
      @ChappalMarungi 3 หลายเดือนก่อน +2

      Your profs went to Harvard?

    • @pfc-5503
      @pfc-5503 3 หลายเดือนก่อน

      ⁠@@ChappalMarungi the one that taught neurology did

  • @shalinig2739
    @shalinig2739 ปีที่แล้ว

    9:26 visual transduction

  • @turanbirligi6969
    @turanbirligi6969 6 หลายเดือนก่อน

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

  • @dianat2002
    @dianat2002 ปีที่แล้ว

    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
    @transcendentphilosophy ปีที่แล้ว

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

  • @amehak1922
    @amehak1922 4 ปีที่แล้ว +1

    Is there anything you don't know about?

  • @Krageon-Offline
    @Krageon-Offline หลายเดือนก่อน +1

    INTEGRATE??? LIKE MATH???

  • @user-iy5db2ic2x
    @user-iy5db2ic2x 7 หลายเดือนก่อน

    Intergrated census.

  • @jmo8a_veda
    @jmo8a_veda ปีที่แล้ว

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

  • @TK-mv6sq
    @TK-mv6sq 2 ปีที่แล้ว

    Lit!

  • @achrafabouras2118
    @achrafabouras2118 2 ปีที่แล้ว

    i wish i was smart

  • @googleyoutubechannel8554
    @googleyoutubechannel8554 ปีที่แล้ว

    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
      @transcendentphilosophy ปีที่แล้ว

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

  • @babarazamsucks
    @babarazamsucks 4 ปีที่แล้ว +1

    First!

  • @simonmoore8776
    @simonmoore8776 2 ปีที่แล้ว

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

  • @HarryNicNicholas
    @HarryNicNicholas 2 ปีที่แล้ว

    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
      @daniel9973 2 ปีที่แล้ว

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

    • @knufyeinundzwanzig2004
      @knufyeinundzwanzig2004 2 ปีที่แล้ว

      Why did you comment this more than once?

  • @SajiSNairNair-tu9dk
    @SajiSNairNair-tu9dk 25 วันที่ผ่านมา

    😂👉🧠👈👉feeling and reflect? 🧏‍♂️

  • @jmo8a_veda
    @jmo8a_veda ปีที่แล้ว

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

  • @eatshitlarrypage.3319
    @eatshitlarrypage.3319 ปีที่แล้ว

    Good video and all, but there are quite a few more than five senses.