Thomas is a 20 year old college student who is living away f…

Thomas is a 20 year old college student who is living away from home for the first time. He lives with 3 roommates and has his own bedroom. He basically goes to class, spends time in his room and doesn’t socialize with his roommates. He also hasn’t made many friends at school. Thomas has started to ignore his personal care go and is not showering. Thomas’ mother asks his roommate to ask Thomas to call her. His roommate knocks on Thomas’ door, but he doesn’t answer. The roommate puts a note on the door for him to call his mother. Thomas isn’t using the phone because he feels the CIA has tapped it and is listening in on his conversations. This disturbance of thought is called?