 He thought it inferior to objective, observable experiments and did not accept the experimental observer’s behaviour could be influenced by the subjective experience.In 1909, at John Hopkins University’s Southern Society for Philosophy and Psychology, Watson stated that “these trends away from introspection will lead psychology toward the perfection of technique of the physical sciences.” Later, in 1913 he declared, “never use the term consciousness, mental state, mind, content, introspectively verifiable, imagery and the like…it can be done in terms of stimulus and response, in terms of habit formation, habit integrations and the like.”

Loeb, a mechanist physiologist, believed animal behaviour was of no particular purpose or design and could be explained in terms of environmental stimulus.He was known for attentive scientific research and as a founder to behaviourism.