What is the biggest effect of Poe's decision to let his readers into the mind of the killer in his story The Tell-Tale Heart?

Answer 1

It creates a nervous, creepy mood

Answer 2

By allowing readers access to the mind of the killer, Poe creates a sense of intimacy and psychological insight into the character's motivations and descent into madness. This technique heightens the tension and Horror of the story, drawing readers into the disturbed mindset of the protagonist and making the narrative more chilling and impactful.