Placeholder Image

Subtitles section Play video

  • visual perception made simple.

  • Yeah, our eyes are like windows to the world.

  • We observe the smallest fluff on the rug and the farthest stars in the sky.

  • At a stadium, we tracked the flight path of a soccer ball and perceived millions of different gradations of car.

  • But how exactly does that work?

  • The essential prerequisite is light.

  • When it enters the eye, it first passes through the lens and the vitreous body before reaching the retina.

  • There, it encounters millions of tiny photo receptor cells with different jobs.

  • Mhm.

  • Three types of cone cells, for instance, react to different wavelengths of light.

  • That's why we can see a variety of colors.

  • However, in order to do their job, the cones need enough light.

  • At night, only the rods are active.

  • They help us to perceive shades of gray and light dark contrasts that keeps us from walking into a lamppost in the dark.

  • But all cats look gray at night.

  • The rods and cones react to the energy of the incoming light and translated into a language.

  • The brain understands electric signals.

  • Other cells down the line process these signals further.

  • Some of those cells heightened light, dark contrasts.

  • Others are in charge of sharpening the image.

  • Nearly 130 million rods and cones are distributed between about one million nerve cells, and each of them transmits a different bit of information that includes tasks related to shape, color, motion, direction and much more.

  • The bundle tales of the nerve cells form the optic nerve.

  • It's like a cable leading from the retina straight into the brain that transmits the signal almost instantaneously important for things like driving a car.

  • Because we have two eyes, we also have to optic nerves.

  • These cross paths and travel from the inter brain through a kind of substation straight into the visual cortex.

  • In the visual cortex.

  • The information from both eyes gets processed, filtered, interpreted compared with existing patterns and then reassembled into a complete picture.

  • Other parts of the brain associate these elements with experiences and emotions.

  • Anything missing is filled in.

  • All of this usually happens unconsciously, However, important stimuli attract our attention.

  • For example, if we recognize a familiar face in the crowd, we look more closely and that irrelevant fluff on the rug.

  • We ignore it, so actually we don't see with our eyes we see with our brains and through visual perception, each human being paints a unique mental picture.

visual perception made simple.

Subtitles and vocabulary

Operation of videos Adjust the video here to display the subtitles

B1 visual nerve perception brain fluff visual cortex

Visual Perception – How It Works

  • 5 0
    林宜悉 posted on 2021/03/01
Video vocabulary