Give examples of a dominant and explain why, with the illusion of an attitude

Give examples of a dominant and explain why, with the illusion of an attitude, we do not immediately notice the figures of children inscribed in the drawing of the brain.

In general, a dominant is a temporarily predominant arousal that occurs when a need is intensified.
The dominant is associated with the illusions of the attitude. For example, we do not immediately notice what we do not expect to see, but we immediately select a holistic image. This perception allows you to quickly analyze the most important thing in the environment and correctly navigate in it. The figures of children are inscribed in the brain and are perceived as its components, respectively, they are details, therefore, first we see the brain, which is a whole image.
Another example of a dominant is the behavior of a person who is busy with something important. He will not be immediately distracted by stimuli.