Answer: Magnetic resonance imaging
Step-by-step explanation:
Magnetic resonance imaging can be defined as a technique which is used for studying the various types of activities inside the brain. It can be done without any surgery.
Images of brain are obtained by using the strong magnetic field. This method is very helpful in medical research especially for brain.
Example a psychologist can observe the change in structure of the brain of the subject performing any task.
The correct answer is Magnetic resonance imaging.