How The Blind Sense and Use Light

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People who are blind, obviously can't see. But new research shows that while they can't see, their brains can! Anthony explains what this means and how this ability actually plays an important role in a blind person's everyday life.
Read More:
Circadian rhythm sleep disorders: lessons from the blind
www.sciencedire...
"As totally blind people cannot perceive the light--dark cycle (the major synchroniser of the circadian pacemaker) their circadian rhythms often "free run" on a cycle slightly longer than 24 h."
Study With Totally Blind People Shows How Light Helps Activate the Brain
www.sciencedail...
"Light enhances brain activity during a cognitive task even in some people who are totally blind, according to a study conducted by researchers at the University of Montreal and Boston's Brigham and Women's Hospital."
Circadian rhythm abnormalities in totally blind people: incidence and clinical significance.
www.ncbi.nlm.ni...
"When people are completely isolated from environmental time cues, their circadian rhythms free run with a nearly 24-h cycle, generated by an internal body clock. Free-running temperature, cortisol, and melatonin rhythms have also been described in totally blind people, even though they were living in normal society and had access to abundant time cues; thus an intact visual system may be essential for synchronization of the circadian system."
Ganglion Cell Layer
en.wikipedia.or...
"The ganglion cell layer (ganglionic layer) is a layer of the retina that consists of retinal ganglion cells and displaced amacrine cells."
Watch More:
What Is Circadian Rhythm?
• How Your Brain's Inter...
TestTube Wild Card
testtube.com/dn...
Stem Cells Cure Blindness
• Stem Cell Treatment Cu...
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Опубликовано:

12 окт 2024

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Комментарии : 290

@Jay-kg7wk 11 лет назад

hey trace, just wanted to say great channel, whenever I'm bored or need something good to watch before eating, I watch DNews on my phone/laptop. very interesting videos everytime, you, anthony and laci are one of the best youtube science channel hosts. I hope you guys like my kind comment

@Azurath100 11 лет назад

I remember hearing about a guy who spent a month in a cave with no direct sunlight and his circadian rhythm was almost matching the day and night cycle. Also, some sleep studies show that some people are day/night/shift people naturally, so the circadian rhythm studies should differ person to person whether blind or otherwise. About receiving the light impulse, since we did evolve from simpler organisms we should see other cells take that job(especially if born blind) and more and more blind are using sonar like Ben Underwood to see too.

@klick2destruct 11 лет назад

I am a member of a band where I play the drums. We came out with this workout idea where we would turn off every light during our bandpractice so we are able to play without watching our instruments all the time. While playing through out set i noticed some differences to playing with the light on. Firstly, it got colder in the room, or at least thats what i felt. Also playing was less exhausting. After no time i knew where every drum and cymbal was, just from memory, even though i didn't see it

@colinbabineau99 11 лет назад

I was born completely blind in my left eye. I can actually confirm this. When I cover my right eye I can still sense light... but not really see it. It's hard to explain but I just know it's there.

@BeC00L123 11 лет назад

I really wanted to know this. Thanks!

@106Torrey 11 лет назад

Its hard to say... I feel like i'm motivated more easily in the dark, or maybe just find it more relaxing to work so I can get to work better, but in the light I think that I can be more productive if I have my mind set to it.

@ALZulas 11 лет назад

I would like to see you guys do a video on blind sight. This phenomenon has been studied for a while now. It's where, the part of the brain that deals with sight is damaged, but not the eyes, so people with this disorder can't see, but they can catch balls, deflect objects, etc.

@sobhitc 11 лет назад

I am with you Antony. I am so efficient during nights. I can not concentrate during morning and I can not work. But during night I am in full energy mode

@Alexaflohr 11 лет назад

Light, definitely light. If I'm struggling to read what's in front of me, or am being bombarded with light from a computer screen with no ambient light around me, then I get very disoriented and often lose track of what's going on.

@SuperMissblueeyes 11 лет назад

There are other cues the body uses to get this information. For example, the birds singing, the warm sun on the face, the volume of traffic, an alarm clock, the type of clothes you're wearing, there are so many things, you'd be amazed. Try the eye mask experiment to experience these things for yourself (I've explained this in a reply to someone else below). I have a blind family member, had a blind Church friend & have worked with blind people. They never cease to amaze me. Also, you could...

@Anemonemarie 11 лет назад

I like working in a dimly lit room. Makes me feel more relaxed.

@SchlimmShadySmash 11 лет назад

Its always so cool to see Anthony being fascinated about some scientific study haha

@veritaskairos9466 11 лет назад

i have seasonal affectictice disorder (sad) and it makes me uber sensitive to light all year around, i can even tell when the days are going to be brighter, shorter, longer, etc......we all need light to function correctly, even on an emotional level.

@TheAstip 11 лет назад

Some people who are blind (depends on what part of the brain was damaged) can 'see' kind of. the signal from sight goes to the part of the brain linked with emotion (like everyone else) but not to the part that 'decodes' what they are seeing making them able to 'see' the mood but not the picture

@Zc0ol 11 лет назад

you might feel that you concentrate better in the dark because the think that you are concentrating on is lit up. if you cant see things in the dark, it makes sense that you have lesser distractions and hence you can focus on the task at hand better.

@brollyfs 11 лет назад

Light is 40 octaves of sound at 90 degrees just like electromagnetism. We use that technology for many purposes including consciousness when combined with the Fibonacci sequence.

@ButtKraken01 11 лет назад

I always fall asleep under a dim florescent light, which is the favorite of classrooms. I would love for a study to be done seeing which lighting situations render the most alertness. I seem to be most awake under natural sunlight.

@AitorElf 11 лет назад

I would have loved to see the experiment run with them bind folded. To see if the activation of skin to sunlight also worked, I understand some chemical processes like vitamin D would only work with sunlight, and maybe we can actually pick up on that to be aware of light... :)

@kenzijeanis 11 лет назад

Well, if you are in a dark room, and you are doing something using another sense, such as sound or feel, the lack of vision can help you remain focused upon what you are doing, especially if one is ADHD.

@camiart_casual 11 лет назад

The thing is, our computer screens give off a lot of light. That's what keeps us awake, the light screws up our internal clocks and we don't get as sleepy as we would if we just let the natural lighting of night take over and tell our bodies "hey! the day's over!" There are actually apps that will change the quality of light your screen gives off so that that doesn't happen.

@logo315 10 лет назад

I loveeeee the dark. It's when I feel most awake. Too much light makes it feel like it's baring down on my and gives me a slight headache. I want a dimly lit room almost complexly dark and I'll be happy

@Da1ienx 11 лет назад

After working nightshifts for nearly 10 years i think my biological clock has completely switched around, even when i have the night off i cant sleep when its dark, the instant the sun comes up i get drowsy. And i am definitely more focused and can concentrate better at night

@fkgabbana 11 лет назад

Maybe your better use of working in a dark room has something to do with your DSPD. I am likely someone with DSPD and I like darker rooms for working, However, it's said that fluorescent lighting can lower our concentration so maybe it has to do with the type of light in the room!

@MizukiUkitake 11 лет назад

Everyone makes typos. I'm very attentive to typos and such, and even then I still mistype their as they're sometimes out of pure habit, especially if I had just typed "they're".

@PaddyMacNasty 11 лет назад

Anthony saying he works better in a dark room - I'll bet he's talking about working on a computer in which case the source of light would be his monitor. The lack of other light would stop him from being distracted but the light from his monitor would keep him focused.

@thathoopy 11 лет назад

I definitely pay attention better in the light!

@georgecataloni4720 11 лет назад

I thought similarly. If you actually can't see, then how are you getting work done enough to say you work better? I think this sudy is more about "enough light to see vs not enough light to see" more than it's about "the more light the better"

@hasanhas00n1 11 лет назад

this layer has been recently "discovered" the one mentioned in the video it was discovered at the begining of this year. thus very little is known about it atm

@candiceblack86 11 лет назад

I like everything dim, florescent lights are my worst nightmare, I've had maintenance turn the ones above my head out for me so I can work.

@teknifix 11 лет назад

I get light sensitive migraines a lot, so dark rooms definitely help. However, I run a printing press, and I have to have a lot of light to see colours properly. This causes issues.

@ClubBangerTV 11 лет назад

i pay more attention in the dark. in school, when the teachers dimmed the classroom lights or used projectors, i focused on my school work more. i always went to school thinking "these lights are too damn bright" and it actually made it worse for me to work under pressure - i.e. MATH. lol. im a little anxious, so you can imagine being called up to answer a question in a class of students with bright lights beaming on your face. also i didn't get enough sleep sometimes so that's probably why.

@ReasonableRadio 11 лет назад

You may work better in a 'dark room', but really you're probably working in front of a computer or at least with a desk-light, so I'd imagine there's more than enough light to stimulate your attention.

@RPSchonherr 11 лет назад

I suspect that when you say you work better in a dark room that the area in which you are working is lighted but the rest of the room is dark. This should reduce your focus to the area that you can see better.

@bettertraining3491 11 лет назад

greater concentration of rods on the periphery of your eyes, more cones in the center. When seeing in the dark, look near, but not at what you are trying to see.

@imagomonkei 11 лет назад

I pay attention better in low-level lighting and natural lighting. In classrooms at school, I absolutely hate it when the teacher turns on the lights. I'd much prefer to conduct class just by the light coming in through the windows.

@xalener 11 лет назад

Maybe people pay attention better in the dark because the source of light is usually focusing on (or actually is) the thing they're actively working on? When you're in a bright room, everything at once is the focus.

@TheCian19 11 лет назад

I pay attention in the dark and it makes sense that in school I preferred when the lights went out I had more energy and motivation

@jlittlejohn97 11 лет назад

I work better when it's dark outside, but I have a light on so it's centered around me and dim everywhere else. Maybe it's about that contrast, which might further activate the brain. Or some people already have a certain level of activity so, when it's bright, It's too much.

@ImaginationEscaped 11 лет назад

Is it bugging anyone else that the description says "they're brains can"...

@SangoProductions213 11 лет назад

When I am in a overly lit room, it's actually distracting. A nice, faint glow is much more preferred by me.

@pianobooks42 11 лет назад

Question: what about the people who had to have their eyes removed? (Like because of cancer for example.) They wouldn't have that piece. What about their internal clocks? How do they stay on schedule?

@biiioya 11 лет назад

I definitely think and work better in a dark room or at night. It might have to do with the fact that I'm easily distracted, though.

@SuperXrunner 11 лет назад

I used to think I function better in the dark also, but as it turns out having the light on really is better.

@benacewoofstorm 11 лет назад

holy shit thank you i also been wondering why i wake up so early when i dont want to and i dont get enough sleep cuz of this thank you soo much !!!

@altair6292 11 лет назад

There is light in night. I focus in both, day and night. I choose to focus, rather then be subjected to other means of action.

@rEsonansDx 11 лет назад

Almost 12 years since I was a kid I was curious if the blind ever sees light. "I was blind, and now I see."

@prektvi 10 лет назад

There is a huge range of what blind and visually impaired people can and can't see. The grand majority of persons we perceive to be totally blind some light perception. Note that light perception does not mean the ability to see color, shape, detail or anything of the sort. It means that they can perceive extremely bright lights and are often extremely sensitive to light. This is why many totally blind people wear sunglasses. The only individuals I have worked with who have zero light perception have had their eyes completely removed. It is extremely rare to meet a totally blind person who still has physical eyes and absolutely no light perception.

@andrewruehling7669 11 лет назад

Quick question, you are just talking about people who have eyes, but they just don't work, and not people who have had their eyes physically removed one way or another, correct?

@MixedTacticsGamer 11 лет назад

Also, what happens if someone has completely lost both eyes? How does an unsynced clock affect them?

@MisfitsToFreaxxs13 11 лет назад

I would Say it's Based on the Day,Temperature and time.

@VariantAEC 11 лет назад

Ah, Good point!

@1996giodude 11 лет назад

I always have to somehow dim my lights to work more comfortably and thus more efficiently :)

@pat999x 11 лет назад

I am much more alert and productive when there is a lot of light around me. In fact, if there isn't enough light, I sometimes just fall asleep.

@dompri2689 11 лет назад

I'd like to see a video of if, blind people dream the same way as the sighted and how they might form visuals if they do. Please Dnews??

@SpeedofLife111 11 лет назад

i think it's the context, in the dark at home i pay no attention but if i were in the desert/tropical rainforest/alaskan tundra at night i would be hypervigilant.

@G40rc3 11 лет назад

i don't feel any different working or studying in a dark room compared to a bright lighted room... as long as i can see what i am doing and have extra light bulbs near me i can be as efficient at night as i am during the day.

@Ahrun51 11 лет назад

did you notice that the tv on the background (might be a green screen) wasn't playing a video

@Turkeysanwhich 11 лет назад

Maybe light feels more concentrated in a dark room, say if you have your monitor or desk lamp on, therefore your brain works better?

@Doctormario4600 11 лет назад

Same with me. Leads to some really bad insomnia.

@sunsetstrike 11 лет назад

I'm disappointed. You guys used the wrong "their" in the description.

@fonfonanime 11 лет назад

Great and informative video guys!

@hinno95 11 лет назад

Well, i can tell within a millionth of a second after turning the light off in my bedroom that my computer led is still flashing.

@brennanmurphy4011 11 лет назад

Does this only work with ganglion cell activation? What if the optic nerve was severed, or the occipital lobe excised? Does someone still respond to these cues?

@graceconnell9685 11 лет назад

Are the people who were tested, born without sight, or were they blind from injury?

@massageman1979 11 лет назад

Okay you got my curiosity up but my son has ADHD now when he comes home from school I am going to turn the TV on with the blue light and I'm just curious as to what will happen when it's homework time.

@Kio_Kurashi 10 лет назад

I think my system is shot. I am attentive at anytime that I am awake. However I do prefer the night because I don't need my sight as much. Not sure what this means and there will probably be people saying that I am stupid or trolling. My direct answer to all of those comments are "show proof or shut up."

@aaronvandyk1793 11 лет назад

Typo in the description, incorrect use of "they're". (So you can fix it) :]

@UsaraDark 11 лет назад

What if the Ganglion Cell Layer breaks down somehow? Will their internal clocks be messed up and can it be fixed?

@shoot4thstars 11 лет назад

Dark. Allows my attention to be 100% in task at hand. Not distracted and processing all the info the light brings.

@thirsty4knowledge200 11 лет назад

I think I pay attention better in a dark place with a lamp focused only on the area that i am working on! maybe my brain shuts surveillance for the surroundings and keep focus on the little spot where the light is. maybe!

@ChunderThunder1 11 лет назад

You misspelled "their" in the description

@vickiel4 11 лет назад

I`m not too sure exactly but I think I work better at night. I find it hard to study in the day for university and I always have to wait until the evening to get at the books.

@Ted-Red 10 лет назад

They also use light to see in the dark !

@PeachPepsi 11 лет назад

I like natural lighted rooms and darker rooms.

@RodasTadeu 11 лет назад

if its dark and silent I can't sleep because I keep my expectancies high, if its sunny, warm and people I trust arround and making noise, that makes me notice that they are arround, I sleep like a baby.

@DarkHypernova 11 лет назад

Wait, if people can get damage at the specefic photoreceptors causing them to go blind. Can we also get damage at those different ones causing cartain people to have difficulty keeping a steady internal clock and/or stay focused?

@alexanderlyndon8393 10 лет назад

Anthony is always requesting an apparatus for the studio. lol. he's right though.

@ButterflyBandit88 11 лет назад

You have trained yourself to realize when the sun is at a certain brightness it is that time of the day. Therefore your brain realizes it's time to get up! Personally I wake up when the room is bright enough. Found this out because in winter I woke up at 8am, now it's bloody 5:30am, every morning! Have to remember to shut the curtains before sleeping now, stupid internal alarm.

@11thNite 11 лет назад

You may work in a dark room but what you're working on is illuminated. No light is coming from anything but what you mean to focus on so your brain won't begin to devote attention to distractions and you can work better. Just a theory.

@caramelzappa 11 лет назад

So basically it's like how your phone has a light sensor to determine screen brightness, but it's completely separate from the actual camera.

@Orsbore 11 лет назад

Oops, you've got a mistake in the description. It should be 'their brains can' not 'they're brains can'

@MrStupidLemon 11 лет назад

do blind people know what colour looks/feels like along with sight itself. Like how we can't possibly imagine any new colour even though they can't be seen by our eyes we can't imagine so can blind people imagine sight, like properly?

@SuperPSTutorials 11 лет назад

It's not they're brains can, it's their. Fix the description.

@thermanlindsey5839 11 лет назад

My bf is some what blind he's eyes don't adjust to light but he works so much better in the dark because the light is so much stronger to him so he generaly sleeps more in light

@hernanlopez5047 10 лет назад

Interesting how blue light is the most important to our biological clock since it is the least amount of light that the sun produces and it is scattered by the sky. Well maybe the fact that it is scattered in the sky makes it the most important.

@imagomonkei 11 лет назад

In the About section, "they're brains can"????? Really, DNews???

@AndrewIsUndercover 11 лет назад

I work better in a darker room, but that is because I am dyslexic and when there is bright light I find it even harder to read than normal.

@5raptorboy1 11 лет назад

Science channel filled with smart people. They used the wrong there in the description,

@MsPulsey 11 лет назад

maybe this could explain why we stay awake longer or have trouble sleeping when it's a full moon or the moon is directly above us.

@Shrimptje 11 лет назад

came here for this. here have my like

@xXEpicFailurXx 11 лет назад

TommyEdison here on youtube is a blind man who answers a lot of those questions. Check him out!

@Showakusai 11 лет назад

But does this happen even if their eyelids are closed? Could it still detect the light?

@SuperMissblueeyes 11 лет назад

...watch the documentary about the boy who sees without eyes. He has no eyes, but can ride a skateboard at speed doing tricks & has never once bumped into anything or had an accident!

@LinkEX 11 лет назад

Since about 200 people gave you a thumbs up within one hour already, I think it's fair to assume that the majority of people here finds the mistake itself far more unbearable than the thought of pointing it out.