Maslow's critique developed during the 1940s in the context of his theory of self-actualization regarding human behavior not simply as the result of a connection between stimulus and response , but also as a combination of feelings, attitudes and desires that constitute the personality as a whole (Maslow, 1968). Rollo May believed that behaviorism was wrong when it stated that the self does not exist and that all behavior is conditioned. He later stated that humans are not mice and cannot be studied and understood in the same way (May 1969). May viewed humans as having the capacity for choice while rats lack the capacity for higher mental functions involving free will. Maslow further added to May's response by stating that behaviorists only see the animalistic aspects of human nature precisely because it focuses on coping behavior (May, 1969). Carl Rogers led to further criticism by stating that there is purpose and choice in human action, which is what Skinner had argued to the contrary (Rogers,