Reflexive writing occurs when the main character is discussing a personal anecdote and presents his or her point of view throughout the story.
In Gothic literature the use of reflexive writing is quite clever because Goth lit is supposed to appeal to the inner depths of one's own consciousness thus evoking the darker side withing all of us, namely, nostalgia, inevitability, sadness, and loneliness.
You can see a lot of reflexive writing in the works of Edgar Allan Poe. In "The Raven" , for instance, the narrator shows us all of his inner feelings, and they all match the premises explained previously. In fact, in "The Fall of the House of Usher", "Maelstrom", and "The Tell-Tale Heart" all show us reflexive writing done in first person subjective omniscient.
This is basically the gist of reflexive writing within the context of Gothic Literature.