Scientist have developed many theories to explain how and why people behave the way they do. In the cognitive scientist view, humans are like computers, that process information. As humans we receive, store and retrieve the information like computers.
"To know that we know what we know, and that we do not know what we do not know, that is true knowledge." Henry David Thoreau
When new information enters through the senses, the new information is compared to existing cognitive structures called " schema".