We are not usually aware of everything that surrounds us in our reality and all the number of decisions that our bodies must make in fractions of a second. Or, how our nervous system works and keeps our body connected to the world, how it analyses all the stimuli which we receive and also how it manages precise and concrete actions.
Let’s imagine this situation. A football match, twenty four seconds into the fifty third minute. (52:24)
The score: nil, nil.
The centre forward crosses the middle of the pitch towards the opponents' penalty box. A lot of information arrives in his brain, from his sensory system: his skin sends information about the atmospheric temperature and even about the slight breeze that blows around him; his ears are perceiving the shouts of the crowd and his team mates; he can even notice the smell of the mown grass and humidity of the air wetting the inner surface of his nose.
But only the autonomous part of his brain is reacting to these stimuli, producing sweat, making his body hair stand up on end. The conscious part of his brain, however, is unaware of all this information due to a general phenomena called lateral inhibition. His brain is totally concentrated on things that are supposed really important: the ball, the goal, the goalkeeper and his position.
The centre forward looks at the ball. The light from the sun impacts against the ball, the grass and the goalkeeper, and all this matter reflects the light, that crosses the air and is arrived at the eyes of our player. It moves through the cornea, then goes the iris and the lens that focuses it on the retina. There, the visual information is transformed into an electric impulse that exits the eye via the optic nerve. (1b)