Cognitive psychology is the study of how humans process information from their environment through mental processes like perception, memory, decision-making, and language. Cognitive psychologists believe that human behavior is guided by mental processes and information processing, the mind can be studied scientifically, and cognitive processes are influenced by social and cultural factors. Schema theory proposes that people organize knowledge into mental representations called schemas, which are networks of beliefs and expectations that influence how people perceive the world based on their prior experiences and knowledge.