Psychologist B. F. Skinner (1904-1990) is recognized as one of the most influential American psychologists and behaviorists. His theory of operant conditioning has had a great impact on what we know about human behaviors today. ＿＿（34）＿＿ Instead, he believed that it was more significant to study human behavior by examining an individual’s external behavior. Skinner conducted his famous experiments with animals being placed in a “skinner box”, a laboratory chamber designed to study behavior conditioning. ＿＿（35）＿＿ Responses from the environment would affect the probability of a repeated behavior. If a behavior was reinforced, it was likely to occur again. In contrast, non-reinforced behaviors might not be repeated and might even die out eventually. Skinner’s theory of operant conditioning can be applied to explain why some learner behaviors are repeated or weakened in the classrooms. ＿＿（36）＿＿ Skinner’s theory fails to account for the fact that human beings are strongly influenced by their mental thinking processes and their peers. ＿＿（37）＿＿ Despite the fact that Skinner’s theory can not account for all human behaviors, it is undeniable that it has demonstrated that the environment is influential enough to strengthen, weaken or modify human behaviors.