<prompt> Instrumental conditioning in learning was introduced and demonstrated by:PavlovSkinnerFreudWatson  <response>: Ans: B Skinner Ref: Pal GK. Physiology of Learning and memory: In: Textbook of medical physiology: Ahuja publishing house. 2007: 121: 919.Explanation:Operant conditioning or instrumental conditioning is a type of learning in which an individuals behavior is modified by its consequences; the behaviour may change in form, frequency, or strengthOperant conditioning is a term that was coined by B. F. Skinner in 1937Operant conditioning is distinguished from classical conditioning or respondent conditioning in that operant conditioning deals with the modification of voluntary behaviour or operant behaviour.Operant behavior operates on the environment and is maintained by its consequences, while classical conditioning deals with the conditioning of reflexive reflex behaviours which are elicited by antecedent conditions 