Ghost

Ghosts are one of the most widely reported paranormal phenomena worldwide. Surveys in the U.S. (Pew, 2009) and UK (YouGov, 2014) find that 30–40% of respondents say they've experienced or witnessed something they attribute to a ghost. Reports range from subtle (cold spots, unexplained sounds, a felt presence) to dramatic (full apparitions, object movement, perceived communication). Proposed explanations divide into three broad categories. The *survival hypothesis* holds that consciousness persists after death and remains perceptible under some conditions; it has no experimental support but persists in spiritualist and many religious frameworks. The *stone tape* hypothesis (T.C. Lethbridge, 1961) proposes that strong emotional events imprint on physical environments and replay; it has no physics behind it but is the standard explanation for repeating, non-interactive 'residual' hauntings. Environmental and psychological explanations — infrasound below 20 Hz (Vic Tandy's 1998 Coventry experiments), electromagnetic-field exposure (Michael Persinger's 'God helmet' work), sleep paralysis, grief-driven misperception, and carbon-monoxide poisoning — account for most cases that come under sustained investigation. The traditional distinction between *residual* hauntings (the same scene replays without awareness) and *intelligent* hauntings (the entity appears to respond) suggests multiple phenomena are grouped under the single English word.

Ghost-encounter narratives are documented across the earliest surviving literature. The *Epic of Gilgamesh* (Standard Babylonian version compiled c. 1200 BCE from older Sumerian materials c. 2100 BCE) ends with the ghost of Enkidu rising through a hole in the earth to speak with Gilgamesh. Homer's *Odyssey* (Book 11, c. 8th century BCE) describes Odysseus summoning the dead in the *nekyia*. The Roman senator Pliny the Younger wrote a fully formed haunted-house narrative in *Letters* 7.27 (~100 CE) about a house at Athens. Medieval European ghost tales were collected in works including the *Otia Imperialia* of Gervase of Tilbury (c. 1211). The Society for Psychical Research's *Phantasms of the Living* (Gurney, Myers, Podmore, 1886) — over 700 first-hand cases — was the first systematic modern empirical study. Modern parapsychology continues through the Rhine Research Center (founded 1962) and the Parapsychological Association (founded 1957).

If you think you're experiencing a haunting, rule out the natural explanations first and in this order: carbon monoxide (install a detector — this saves lives, since CO poisoning produces auditory and visual hallucinations); drafts and structural settling; infrasound from fans, AC units, or industrial sources nearby; electromagnetic fields from old wiring; wildlife or rodents. Keep a written log of incidents with date, time, location, weather, what you were doing in the preceding hour, and any witnesses. Approach with curiosity rather than fear — fear amplifies misperception. For communication attempts, a simple verbal address is safer than spirit boards (Ouija) which, regardless of their metaphysical status, reliably produce ideomotor responses that feel like external contact and can be unsettling. Loyd Auerbach's *ESP, Hauntings and Poltergeists* (1986) is a well-grounded reference.