Why does everything covered in chapters 8, 9, and 10 fall under the field of psychology?

In chapter 8, the chapter of learning, the main component is how the brain can remember, learn, and become conditioned to certain behaviors and information.  The cognitive processes can be studied of how reinforcements and punishments can affect the brain.  Also, in rats and mazes, experiments show the cognitive processes and how the rats developed cognitive maps of the maze.  In chapter 9, the chapter regarding memory, the chapter studies how we receive, encode, process, and store the information through sensory memory, short-term memory, and long-term memory.  All of these processes easily can be part of cognitive psychology since cognitive psychology itself is the study of how we encode, process, store, and retrieve information.  Finally, cognitive psychology is a major part of chapter 10 as the chapter deals with thinking and language.  Thinking is also known as cognition and is the mental activities associated with understanding and remembering.  Cognitive psychologists study the mental activities involved in thinking.
~~Amanda