[zeroca]

When reading the brief course of psychology (part - attention), I came across one interesting experiment: as it appears, the individual doesn’t perceive by vision everything that’s in the field of vision (for instance, if we are looking at the blackboard with 20 different numbers written on it, we don’t perceive simultaneously all, but only part of them) despite impressing of all of them on the retina. What’s the reason? i.e. why all numbers aren’t perceived despite them being within the field of vision? It was told in the conclusion that volume of attention is restricted (defined).

As experiment revealed, volume of attention usually equals to 5-6 simple impressions. When in the device, called tacho-scope, the persons were shown huge amount of black points with the speed of one/tenth, or one/fourth of second, the persons couldn’t perceive more than six ones at the time. (The number of shown simultaneously perceived objects lessens to five, if instead of black points small pictures of numbers are displayed)
As a conclusion, the person generally can’t perceive all material that’s impressed on the retina. The question, why, isn’t answered yet, at least I didn’t find what is material substrate, ground for such perception in detail.
I offer a simple animation, as test for readers:
You should concentrate on red point within the circle and test, how many numbers or letters you can read at the same time. I can 4-5 including red point.
The technique of animation: there are 40 frames in animation and speed is 4 frames/sec, i.e. the time of appearance of one frame is one fourth part of second. Numbers and red point are placed within the same one frame.