Science
The Brain Doesn’t Create Consciousness — It Constrains It
For centuries, scientists and philosophers have pondered one of the most profound mysteries of human existence: consciousness. The very essence of being aware and experiencing the world has captivated the human mind. Traditionally, we’ve been taught that consciousness arises from the brain, with each neuron firing like a spark to create a dazzling display of thoughts, feelings, and awareness. But what if we’ve been thinking about it all wrong? What if the brain doesn’t create consciousness but rather constrains it?
By Komal Ghotraabout a year ago in Chapters
The shape that changed our world forever
Did you know that stop signs used to be yellow back in the 1920s even though red had already become known for stop in traffic lights the convention in science wasn't yet established and there were two major problems with red one there wasn't yet a way to make red pigment that wouldn't fade and two red is way harder to see at night you see your eye has three types of cones that detect color red green and blue cones but at night there isn't enough light to activate these cones in your retina and so your eyes rely on rods which are much better at perceiving low light and if we look at the wavelength sensitivity of rods you'll notice they actually don't even pick up red wavelengths when we see red at night it can only be picked up by cones and as a result red is the hardest color to see in low light so while a traffic light shining right is one thing a lowly lit red sign is completely different on top of this even in daylight our eyes are actually most sensitive to a yellow greenish color this is because it's right in the overlap between our red and green cone sensitivity peaking at about 550 nanometers making it a perfect option for visibility but not exactly one for consistency with red meaning stop so when did the switch to red signs happen and how did we overcome this hurdle it's actually one of the most ingenious and coolest inventions to ever come about retro reflection .
By TBH Agencia Exclusiva Colsanitasabout a year ago in Chapters
Strokes
Rapid onset of cerebral deficit or apoplexy. There are two types of strokes Non Hemorrhagic Stroke Hemorrhagic Stroke Non Hemorrhagic Stroke include Ischemic Stroke(thrombotic embolic)which means "Plaque formation in arterial wall, Plaque breaks away and gets lodge into brain"
By umamanidrah2 years ago in Chapters
Only 12% of People Can See This!
stare at this image for five seconds and without realizing it the photoreceptors at the back of your eyes will start to become fatigued so much so that when this image turns white you see the green birds as red and the red background is green all of this happens because of biological processes in your eyes that link you to the lives of pollinating insects can help you design bedrooms or rooms in your house to be more satisfying and can also explain why women can see better than men seeing color is so freaking cool it kind of mixes science with sensation and over millions of years our eyes have evolved to see wavelengths on the electromagnetic spectrum roughly between 380 nanometers to around 700 nanometers that's it wavelengths longer than this you get into radio waves and microwaves which our eyes cannot see but they can send a text wavelength shorter than this you get into uv rays and gamma rays again your eyes cannot see but they can damage your cells and cause cancer but if we hone in on the wavelengths of color there are specific patterns that our eyes pick up most people see less than 450 nanometers as violet 450 to 485 nanometers as blue 500 to 550 nanometers as green 570 to 590 nanometers as yellow 590 to 625 nanometers you got gold 625 nanometers and above you get red now no object actually possesses any color which is so weird to say all an object does is absorb certain wavelengths of light and then reflect others for example this gorgeous teal seafoam coral blue is absorbing all the colors except for that seafoam teal gorgeous blue which is being reflected to your eye and your brain is interpreting this as color for example if you're looking at one of my favorite flowers the goldenrod which blooms in august the flowers are absorbing every wavelength of light except for the ones between 590 to 625 nanometers again as we said earlier which most people see as gold this light is sent to your cornea which bends it towards the pupil that controls the amount of light hitting the lens which focuses the wavelengths onto the back of your eye called the retina at the back of your eye the retina is covered in photoreceptor cells called cones you have around six million cone cells which absorb light and pass it onto the brain's visual cortex to be interpreted as color this is a biological process that's happening all the time you're looking at this screen i'm looking at this blue sky you're looking at me i'm looking at you and oh this is a connection my friends now your cone cells at the back of your eye are divided into three different types you got red cone cells green cone cells and blue cone cells rgb since you have three types you are visually trichromatic so you can walk around order your coffee and say by the way you me we're trichromatic some other animals for example are tetrachromatic and can even see within the uv wavelengths some birds some fish which i'm sorry are cooler than us that's a rad thing to do they are superheroes we are measly trichromats sit down folks because this science is complicated but the red cone optimal for perceiving the color red the blue cone optimal for perceiving the color blue and you guessed it the green cone optimal for perceiving the color grain but these cells work in combination for you to see over 10 million different colors unless you're 12 percent of women who can see way more than that more on that later but the nature of these cone cells are what create complementary colors that we perceive as satisfying now a complement is something that lacks a hole so for example this circle is a complement of this rectangle with the missing section together they make a hole that's a whole wh w-h-o-l-e not a hole like here here here or a couple down here if i showed you the ones down here we'd be on a different tube site according to the physics of light a complementary color for your eye are two colors that when combined produce white light it's a law of nature it's fascinating it's why we have complementary colors for our eyes and it has to do with how our cones work look at this black and white image if we put on the complementary colors of the original picture and you stare at this dot for a few seconds due to the specific stimulus on your eye the background we used and the perception of your red green and blue cone receptors when we put back this black and white image you see the color i do this all the time just for fun i'm like gosh dang my eyes and brain are insane the reason that this happens is because your eyes are so sensitive to these wavelengths that the cones become overused and oversaturated when looking at the same color the stimulus can start to spread to other cones nearby and when the stimulus is taken away the tired cones and your visual cortex default to seeing the complementary colors this is why we love looking at complementary colors beside each other they have energetic reciprocity going back to this image when staring at the green your green and blue cone cells become fatigued but the red isn't really being used in these sections so when you switch to white your brain reads these sections as red the red cone start to trigger your brain to see red it's all just about perception it's wild because it's like through these two little things that i'm seeing everything and living my life purple and gold are a reciprocal pair that our trichromatic eyes and the eyes of bees see very similarly golden rod and purple asters grow together so that bees find them attractive and this increases their pollination these flowers evolve to grow together to help pollination with bees they weren't for us but because of the energetic reciprocity of our cones being similar to that of bees we get to reap the benefits of this energetic beauty when looking at flowers when you see gold and you see purple and it feels good thank the bees when designing a room take a look at this light complementary color wheel if you focus on the complements of each other throughout your room you're going to be designing pleasing scenarios for the cones of your eye this can really help you make decisions about how you're going to design your room just think about the physiology of your freaking brain now for men seeing color can be more of an issue this is because the genes that encode red and green cones show high sequence homology on the x chromosome so although gender and sex can fall on a spectrum for the most part people who identify as women have xx chromosomes and people who identify as men have x y chromosomes and it's this y chromosome for people like me who have a y chromosome we are more likely to not be able to see red and green as well this is why statistically men are much more likely to be colorblind but on top of this there's a lot of new research but it is starting to be found out that 12 of women are actually tetrachromats they have an extra cone and can see a hundred times more color than the rest of us i got into a rabbit hole of all this research after being in nature and just looking at all these beautiful colors that were so soothing to my eye my brain my perception and it almost just was like what is beauty science has a hard time defining beauty you know beauty is in the eye of the beholder but when you look at these complementary light color wheels you start to realize there are some things we can do in our lives to better understand the physics of light our eyes and our brain and utilize this thinking to benefit our lives essentially this is just a video enticing you to get out there and of course stop and smell the flowers but also stop and look at those flowers see you next week for a new science video peace
By TBH Agencia Exclusiva Colsanitas2 years ago in Chapters
