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Cognitive psychology is the scientific study of how humans (and animals and, in some cases, computers) process information. Traditionally, cognitive psychologists have made a distinction among different areas of study: memory, attention, categorization, language acquisition and use, decision-making, and one or two other topics. Many believe that attention and memory are closely related, that you can't remember things that you didn't pay attention to in the first place. There has been relatively less attention paid to the important interrelationship among categorization, attention, and memory.