2.Retinal projection
I'll start with an example - when we read something from the monitor and gradually turn the mouse wheel to move the text, the text is not blurred ... although it should be) This is a very interesting trick - here the visual cortex is connected to the work.
It constantly keeps the image in the buffer and when the object / text in front of the viewer quickly shifts the image and superimposes on the real image.
And how does she know where to move it?
Very simply - your finger movement on the wheel is already studied by the motor cortex to millimeters ... Visual and motor areas work synchronously, so you do not see the lubricant.
The optic nerve
From each eye comes out the optic nerve density of ~ 1 Mp (from 770 thousand to 1.6 million pixels - who is lucky), then the nerves from the left and right eyes intersect in the optical chiasm - this is seen in the first picture - there is a mixture of axons about 53% from each eye.
Then these two bundles fall into the left and right parts of the thalamus - this is a "distributor" of signals in the heart of the brain.
In the thalamus occurs, we can say, the primary "retouch" of the picture - increases the contrast.
Then the signal from the thalamus enters the visual cortex.
And here is an incredible number of processes, here are the main ones:
1. The merging of pictures from two eyes into one - there is something like an overlay (1 MP and remains),
2. definition of elementary forms - sticks, circles, triangles,
3. Definition of complex patterns - faces, houses, cars, etc,
motion processing,
4. Painting a picture. Yes, it is the painting, before that, the cortex just received analog pulses of different frequencies,
5. Retouching of blind areas of the retina - without this we would have seen two dark grey spots the size of an apple in front of us all the time,
a lot more Photoshop,
6. the output of the final image is what you call vision - a phenomenon of vision.
So why, you ask, do we not see individual pixels? The picture should be very poor, as on the old console!
This is the essence of the phenomenology of vision - you have ONE visual system. You cannot look at your own picture from the outside.
If a person had two visual systems and could switch from system 1 to system 2 and evaluate how the first system works - then yes, the situation would be sad.
But having one visual system YOU are the picture you see!
The visual cortex itself is aware of the process of vision. Read this several times.
In case of trauma to the primary visual cortex a person does not understand that he is blind - it is called anozognosis, i.e. he does not see the picture at all, but he can walk normally along the corridor with obstacles (first reference in the list).
Concluding this, I hope, brief and clear article, I want to remind - we all have a picture in ~1 Mp... live with it.
To be continued in the next part https://zen.yandex.ru/profile/editor/id/5d7f7f203639e600ac6686e5/5d908be47cccba00b00c21a7/edit