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Ghost
A ghost is, in popular belief, the apparition of a deceased person or of a non-physical entity that manifests in a place or to a person. The phenomenology (visual apparitions, noises, objects that move, sensations of presence) is widely documented in cultures around the world.
Explanations
Psychology explains ghost experiences through pareidolia (seeing figures in ambiguous stimuli), cultural expectations, hypnagogic hallucinations (in the state between waking and sleeping), group suggestion. Studies of "haunted houses" have often identified physical causes (draughts, infrasound, carbon monoxide, electrical problems). Parapsychology continues to study residual cases without reaching conclusions accepted by the scientific community.
Culture
Ghosts are present in every culture: spirits of the dead (popular Christianity), returning ancestors (Asian cultures), Japanese yurei, Irish banshees. The literature of the fantastic (Shakespeare, Dickens, James) and horror cinema have made the ghost a central imaginative figure. They remain a cultural universal of great symbolic power.
FAQ
Do ghosts exist?
Not in a scientifically verified sense. Reported experiences have psychological or physical explanations in most cases.
Can I see a ghost?
People in recent bereavement or acute fatigue can have intense perceptual experiences. For significant doubts, consult a doctor.
Is it dangerous to "summon" them?
Practices such as the ouija board can produce group suggestion and anxiety. Psychologically, it is inadvisable to do so when in a vulnerable state.