Auditory hallucinations are the most common type of hallucination. This ambiguity of memory and perception can escalate to delusion, hallucination, or delirious paranoia. Infrequent adverse effects include urinary retention, palpitations, hypotension, headache, hallucination, and psychosis. Titli is a hallucination, a figment of Aparna's imagination. In season five, Moira is seen as a figment of Oliver's Dominators-induced hallucination. Even when consciousness is impaired, insight into the hallucination or illusion is typically preserved. In many cases, tinnitus is an elementary auditory hallucination. He ignores Marty's reassurances that his vision was a peyote-induced hallucination. Out of these, 1,684 persons admitted to having experienced a hallucination of an apparition. Boris hallucinates ("Hallucination or 'Clock' Scene"). Blake was the subject of Ginsberg's self-defining auditory hallucination and revelation in 1948. He returned for the flashbacks of Shannon, Nikki Fernandez and Paulo and Locke's hallucination. The vision ends with Max hugging Devi, who turns out to be a hallucination. James is quick to dismiss the latter scenario as being a hallucination. After experiencing a hallucination of his father, Gordon decides to rejoin the department.