Final answer:
The professor is likely to use the approach of Neuropsychology to determine what portions of the brain are involved in trying to recall a word that is on the tip of your tongue.
Step-by-step explanation:
The professor who is trying to determine what portions of the brain are involved in trying to recall a word that is on the tip of your tongue is likely to use the approach of Neuropsychology. Neuropsychology is a branch of psychology that focuses on how the brain and nervous system impact behavior and cognitive functions.