Explain the difference in opinion between Dr. Norman and stop stress concerning the definition of IQ explain the irony here

Doctor Nemur is the psychologist who developed the theories behind the experimental operation given to Charlie. .He is initially against giving the surgery to Charlie and then becomes resentful when Charlie’s intelligence rivals his own. Dr. Strass cares more about Charlie. He even tries to help Charlie when the effects of the experiment wear off. Both men have a different deffinition of what IQ means.