What is the author's style in The Pit and the Pendulum by Edgar Allan Poe?

By placing us, as readers, solely in the head of a prisoner with nothing more than his own thoughts, Poe intensifies the emotion and sense of "being there."

"At length, with a wild desperation at heart, I quickly unclosed my eyes. My worst thoughts, then, were confirmed. The blackness of eternal night encompassed me. I struggled for breath. The intensity of the darkness seemed to oppress and stifle me. The atmosphere was intolerably close. I still lay quietly, and made effort to exercise my reason."