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'''Behavioral psychology''' is a major [[paradigm]] of [[psychology]] that focuses on describing organism [[behavior]] as a product of environmental inputs. Behaviorist view the [[mind]] as a [[black box]] and do not believe that it can be defined or investigated with the [[scientific method]]. Behavioral psychology views all organism behavior as an output derived purely from the input of the environment.
The most well known area of investigation is the role of [[classical conditioning]] and [[instrumental learning]]. The work of [[Ivan Pavlov]] at the start of the 20th century demonstrated that an unrelated [[stimulus]], such as a bell, could elicit a [[reflexive]] response, such as a salivation, if the bell had been paired repeatedly with a stimulus that naturally creates that response, such as the presentation of food. The number of pairings needed and the size of the response could be mathematically described and offered hope that a science of psychology could emerge that had the mathematical properties of other sciences such as [[physics]]. [[B.F. Skinner]] was a major proponent of the paradigm and developed the concept of instrumental learning, where complex behavior could be learned by rewarding small increments of behavior. Skinner believed all behavior, including that of humans, could be described completely by environmental inputs.
In modern research there are few die hard behaviorist, the [[cognitive revolution]] showed to many that it was both possible and necessary to describe the minds role in behavior.