Attention and Mentality
Attention does not exist on its own. It's always accompanied by some mental process (perception, thinking, etc.). At the same time, the “searchlight” of attention “touches” and analyzes the environment. Since instant perception of the whole environment is impossible, your attention highlights a part that contains the necessary object. Such limitation and “filtration” of excess information creates a clearer image of the object. It lets you successfully carry out intellectual operations, e.g. understand texts, solve tasks, etc.