All about time: Part I. Our perception of time.

Yuotube's videos at 30 fps in English is Frames per second, which means you're seeing 30 photos every second, but as it happens so fast it gives you the sensation of seeing something moving, for this reason youtube videos that are at 60 fps they look more fluid, but where is the limit, how many fps does the human eye work ?, it depends on the person, the average is at 45 fps, meaning that for many people the videos at 60 fps are more well of what they can appreciate, they have information about 25% of the population that can appreciate those 60 fps and it is due to this limitation of images that sometimes we see how the wheels of the cars seem to go backwards sure have you ever seen that if a wheel accelerates its turn comes a time when it starts to seem to slow down until it stops and then starts to turn in the opposite direction, this is because the brain is not capable of processing so many And due to a certain frequency of the different turn in each person, the brain sees what this effect can and does occur although there are people who can see much more.

Studies carried out on military pilots showed that in some extreme cases, these people can see 220 fps, this is because they have trained their brains to be able to appreciate the very fast important details that occur when flying, this is a skill that can be train within the limits imposed by our biology, but you must accept that you do not have a continuous perception of reality, they are continuous photos stuck by your brain, although I would consider it a good thing in terms of memory reserves, taking into account the resolution With the one that captures our eyes in the world, we could say that we capture the world with 8 megapixels. This is the number that comes out when you take into account the human field of vision, the types of receptors that we have in our eye and the density with the one that are scattered around our retina.

Our eyes can not be compared directly with a camera, we have a very regular, heterogeneous vision, for example, in each of your eyes there is a small area called fovea that corresponds exactly to the center of the field of vision and that contains approximately half of all the receptors in your eyes, the area of ​​the fovea is tiny the size of your two thumbs together when you stretch your arms and 50% of your vision is concentrated in this tiny point, something very curious about the phobia is that it only contains cones but not poles.

Remember that the cones are the cells responsible for perceiving light when it is abundant while the rods otherwise are those cells that allow you to see in dark conditions, for evolutionary reasons the cones are much more important for us, since we make life of day and that is why the most important part of our field of vision abound in the fovea.

If you go to the Terrace one day to observe the sky and the stars, do not be scared if you fix the vision to try to see a little bright star that you perceive with the peripheral vision, you disappear or you can not see it, this happens because in that area is the fovea that lacks sticks is unable to see the palest lights, you can see for yourself, you just have to look at the less bright stars of the sky right with the center of your eyes.