Use scientific methodology to study behavior and mental processes in order to understand why people behave, think and feel the way they do in a variety of situations.

I believe the answer is: Psychologist
Psychology is a discipline that aimed to study all aspects of mind and behavior (both conscious and unconscious)
Scientific methodology under this discipline is used to found out the pattern on how the majority people react/behave when they're placed under certain occurrences

Rehab i’m not sure but i hope this

Hamlet's fourth soliloquy is probably his most famous one - "to be or not to be."it is rather different from his previous soliloquies because now he is contemplating something that didn't come up before - suicide. he is thinking whether it is worth it to fight to find his father's murderer when in the end all of them are going to die, so why not die sooner than later. he is contemplating if he should go on fighting or just kill himself and end it all, which is why this soliloquy in particular is rather depressing, hesitant, and gives a deeper insight into hamlet's madness.