Your house is not haunted, and that is a finding rather than a reassurance. In 2014 Olaf Blanke's group manufactured the feeling of a presence in healthy people: a blindfolded participant moved a lever, a robot reproduced the movement against their back, and a half-second delay was enough that one in three felt someone standing behind them — two asked for the experiment to stop. Nobody was ever in the room with them. What this record describes is that effect imposed rather than induced: phantom sensations across every sense, and visuals reproducing what a haunting is supposed to look like. The terror is the mechanism — a household driven outside will accept help from whoever is waiting, and what this record says waits there is a facilitator of Zersetzung tactics and a suggestion of euthanasia.
The published work stands on its own. Blanke's experiment ran on thirty healthy participants; roughly a third spontaneously reported someone behind them, some reported several, and a pooled analysis across twenty-five such experiments has since been published. When the reproduction was simultaneous, participants felt themselves touching their own back; when it was delayed, the brain could no longer attribute the touch to the person's own movement and resolved the conflict by generating somebody else. Of thirty healthy participants, roughly a third spontaneously reported feeling someone behind them, touching them. Some reported several people. Two found it distressing enough to ask that the experiment stop. A pooled analysis across twenty-five such experiments has since been published. The direction of that finding is the point. The presence was not detected. It was manufactured by the participant's own nervous system out of a half-second timing error, with nobody there. Other findings converge. Sleep paralysis produces felt presence, chest pressure and an inability to move, and the cross-cultural literature records the same physiology interpreted as demons, witches, spirits or visitors depending on where the sleeper grew up. And when researchers tested the best-known claim that electromagnetic fields induce a sensed presence, it failed to replicate: Granqvist and colleagues reported in 2005 that the experiences tracked suggestibility rather than the fields. None of this establishes the cause of any particular person's experience. What it establishes is that vivid, specific, frightening presence and touch require no external source at all — and that anyone trying to work out what is happening to them deserves to know the brain does this unaided before concluding that something is being done to them.
- Blanke et al., Current Biology, 6 November 2014: robotically induced presence hallucination in 30 healthy participants; ~1 in 3 spontaneously reported someone behind them touching them; some reported several; two asked to stop
- The effect depends on a sub-second delay between the participant's own movement and the touch — a sensorimotor timing conflict, not a stimulus
- A pooled analysis across 25 presence-hallucination induction experiments has since been published
- Sleep paralysis: felt presence, chest pressure and atonia, interpreted cross-culturally as demons, witches, spirits or visitors
- Granqvist et al., 2005: sensed presence and mystical experience predicted by suggestibility, not by transcranial weak complex magnetic fields — a failed replication of the best-known EM claim
Open questions
- This does not establish the cause of any particular experience, including the author's.
- A mechanism that requires no external agent does not prove that no external agent exists in a given case. It removes the necessity, not the possibility.
- The Granqvist result concerns weak transcranial fields under laboratory conditions. It does not speak to every claim about electromagnetic exposure.
References
- Phantom sensations
- Does the explanation itself do harm?
- What would it actually take to do this without consent?
- Ghost illusion created in the lab — Blanke lab (EPFL)
The glossary entry defines a term used on this site and is not independent evidence. The two linked concepts are the companion arguments: one on what an explanation costs, one on where documented capability stops.
Not independently verified
This concept reports published neuroscience. It does not establish the cause of any individual's experience, and it does not assert that any reported experience was internally generated.
Topics: Harassment · Speculation · Technology · Euthanization · Obedience & coercion · Health & physical effects