The Narrator is a Paranoid Schizophrenic, but back in his time period, almost nobody knew or could identify what that was. Schizophrenics often see things or hear voices in their head that "persuade" them to do things, and occasionally are set off by a specific object. In this man's case, it was the old man's eye. Paranoid schizo's are actually known to have sharpened hearing, which was why the Narrator talked about his "sharpened senses". Throughout the story, he went over the fact that he wasn't a madman, but the assurances were more for himself than the reader. He went over every detail of the killing, assuring the reader that he wasn't crazy, when really, his "normal side" was the person that he was trying to persuade. When the police show up, he seems to be almost spectating the interrogation, and finds it amusing. Then the paranoia kicks in, and he thinks he sees the Eye, then the heartbeat, and believes the policemen are just toying with him. He finally snaps and shows them the body, feeling a great sense of relief. In short, the narrator was at war with both sides of his personalities, and his schizophrenia eventually ate him up.
The narrator in "The Tell-Tale Heart" is nervous due to the conflict between his desire to prove his sanity and his guilt over the murder he has committed. This internal conflict escalates as he becomes increasingly overwhelmed by the guilt of his actions, causing him to hear the sound of the old man's heart beating.
how their relationship ended
The brain is the part of the peripheral nervous system that controls glandular activity and the muscles of the internal organs.
he's sane
the autonomic nervous system
he's sane.
The nervous system coordinates the body's response to changes in the internal and external environments The sense organs are part of the peripheral nervous system..
Nervous System
nervous & passionate
The nervous system.
The autonomic nervous system is responsible for the control of the functions of the internal organs and it has two divisions. These are the sympathetic nervous system and the parasympathetic nervous system.
nervous system
From what I can tell from the context, I believe that the narrator is admitting that he is nervous and had been nervous, but denies that he is crazy.