Spooky

The English word spook enters print in 1801, in a comical dialect poem in the Massachusetts Spy. Hans is meant to be an old Dutchman from Albany; the joke is his accented English. He fears a Yankee will steal his Notchie, and threatens to fly after her — in his rendered Dutch — zo swift as any spook.

The route was demographic. Dutch settlers in New Netherland had kept spook alive in the Hudson Valley for a century and a half after the British took the colony in 1664. English already had ghost (Old English gāst, “breath”) and specter (Latin spectrum, “appearance”). What it didn’t have was a syllable so foreign it amused. The first known printed appearance of spook in English is a fictional Dutchman’s promise to move like a ghost.

On March 3, 1947, Albert Einstein sat down to write to Max Born. The two had been corresponding since 1916 — across exile, war, the slow gathering of evidence that the quantum theory Einstein had helped found was not the kind of theory he wanted it to be. Born had been arguing, again, for the statistical interpretation. Einstein objected, again. He reached for spukhaft — ghostly — the same Germanic root that had become spook in American English a century and a half earlier.

The two particles of an EPR pair (described in Einstein’s 1935 paper with Boris Podolsky and Nathan Rosen) appeared to remain correlated after separation in a way no local mechanism could produce. Einstein’s position: this could not be a real feature of the world. There must be local hidden variables underneath, currently unknown, that would dissolve the appearance of spookiness. He used a Halloween word to mark out what physics was not allowed to be.

Seventeen years later, in 1964, John Stewart Bell at CERN proved a theorem: no theory built on local hidden variables can reproduce all the predictions of quantum mechanics for entangled particles. Either the world has nonlocal effects, or quantum mechanics is wrong. Bell turned Einstein’s complaint into a measurable inequality.

Stuart Freedman and John Clauser at Berkeley ran the first experimental test in 1972. Alain Aspect at Orsay refined it in 1981–82 with a two-channel design. Anton Zeilinger’s group in Vienna closed remaining loopholes through the 2000s. The 2015 loophole-free Bell tests at Delft, Vienna, and NIST closed the locality and detection loopholes simultaneously. Modern Bell-test violations are clocked at tens of standard deviations above the classical bound. In October 2022, Aspect, Clauser, and Zeilinger shared the Nobel Prize in Physics, “for experiments with entangled photons, establishing the violation of Bell inequalities and pioneering quantum information science.” The spooky thing happens. Einstein was wrong about which side of the experiment reality was on.

A creature in an ancestral environment hears a rustle in the grass. It has two errors available. Type I: assume a predator when it is only wind. Cost: a wasted startle. Type II: assume wind when it is a predator. Cost: being eaten. The two costs are not symmetric.

Justin Barrett at Calvin College named the cognitive substrate in 2000: the Hyperactive Agency Detection Device — HADD. Its logic is the smoke detector’s. A smoke alarm is calibrated to false alarms because the cost of missing a fire is far higher than the cost of crying wolf; human agency detection is calibrated the same way. We see agents in shadows, faces in tortillas, intentions in coincidences, ghosts in cold drafts. The bias toward false positives is not a bug. It is the rational response to an asymmetric loss function. The fusiform face area fires for face-like patterns in noise even when the subject knows there is no face. You cannot will yourself out of pareidolia. The recognition is pre-conscious.

Roughly a third to a half of people, surveyed across modernized and non-modernized cultures, report at least one paranormal experience — a ghost sighting, a sensed presence, the conviction of hearing the dead. The figure is roughly invariant across belief systems. The cognitive substrate is the substrate; the beliefs are decoration on top of a Pleistocene alarm system that has not been recalibrated.

Vic Tandy was a British engineer working late at a medical-equipment laboratory in Warwick in 1998. He was alone. He felt cold. He sensed a presence behind him. At the edge of his peripheral vision he saw a gray figure. When he turned to look directly at it, the figure was gone.

The next afternoon, preparing for a fencing match, Tandy clamped his foil in a vise on a workbench. The blade began to vibrate. Nothing was touching it. He moved the vise around the room; the vibration peaked in the spot where he had felt the presence the night before. He measured. The lab’s new extractor fan was producing a standing wave at 18.98 Hz.

The English word nightmare contains a sleeping etymology. Mare is not the female horse. It is Old English mǣre — a goblin, an incubus, an evil spirit that sat on sleepers’ chests at night. Mæran meant to crush. The word survives in French cauchemar (caucher “to press” + mare) and Dutch nachtmerrie. The English word for a bad dream is, etymologically, the name of the demon that caused it.

The phenomenon is real. During REM sleep, motor neurons are inhibited via descending brainstem pathways — atonia, which prevents the sleeper from acting out their dreams. If consciousness returns before atonia ends, the sleeper is awake but cannot move, for thirty seconds to several minutes. The standard accompaniments are hypnagogic hallucinations: a sensed presence in the room, pressure on the chest, the impression of a figure approaching.

The cross-cultural convergence is uncanny. The Newfoundland Old Hag (David Hufford’s 1982 ethnography is the founding study); Japanese kanashibari, “bound in metal”; Brazilian pisadeira, “the one who steps on you,” a thin old woman with long fingernails; Cambodian khmaoch sangkat, “the ghost that pushes you down”; Italian pandafeche, a witch-cat hybrid; Arabic jinn attack. Hufford estimated that roughly fifteen percent of people experience the chest-sitting hag at least once. The phenomenology is essentially identical across continents.

Sigmund Freud published Das Unheimliche in 1919, building on a 1906 paper by the German psychiatrist Ernst Jentsch. The German title is literal: un-heim-lich — un-home-ly. The uncanny is not the unfamiliar. It is the familiar that has stopped being familiar.

Freud noticed something strange in the etymology: heimlich (homely, familiar) and unheimlich (its antonym) share a sense. Heimlich also means secret, concealed — what is hidden inside the home. The unheimlich is therefore what should have remained hidden and has come out. The German word names the structure. The uncanny is the home secret that has surfaced. His catalogue: doubles, severed limbs that move, automata, the same thing happening twice, being lost and returning to the same spot.

In 1970, a robotics engineer at the Tokyo Institute of Technology named Masahiro Mori published a two-page essay in the obscure Japanese journal Energy. He drew a graph. The x-axis was human similarity; the y-axis was shinwakan, the felt sense of affinity. The curve rose through stuffed animals and humanoid robots, dipped sharply just before reaching human likeness, then rose again. Mori called the dip bukimi no tani, the valley of eeriness. English calls it the uncanny valley. Saygin and colleagues at UCSD showed in 2012 that the dip corresponds to peak activity in the action-prediction network — the brain expects natural human motion and gets not-quite-natural human motion. The uncanny feeling has a circuit. It is the felt sense of a prediction error.

In 1923, the French psychiatrist Joseph Capgras and his intern Jean Reboul-Lachaux published a case report on a Parisian woman, Mme. M., who had become convinced her husband and children had been abducted and replaced by identical-looking impostors. She called the replacements sosies — doubles. The paper title: L’illusion des “Sosies”. The condition is now called Capgras delusion. It occurs in a subset of schizophrenia, in dementia, and after stroke or brain injury.

In the 1990s V. S. Ramachandran proposed a mechanism. Face recognition runs in two streams. The ventral stream identifies the face. A separate route through the amygdala generates the felt sense that this is my person. Ramachandran measured skin conductance response — the autonomic signal of emotional engagement — when Capgras patients were shown photos of their family. Normal subjects show clear SCR spikes for family faces versus strangers. Capgras patients showed flat SCR. The brain knew the face. It did not feel the familiarity. The patients’ confabulation: this person is an impostor.

In April 1815, Mount Tambora on Sumbawa — in what the Dutch then called the East Indies — erupted with a Volcanic Explosivity Index of 7, ejecting 37 to 45 cubic kilometers of dense-rock material. It was, and remains, the largest volcanic eruption in recorded human history. Stratospheric sulfate aerosols spread around the globe; in 1816, average Northern Hemisphere summer temperatures dropped by an estimated 0.4 to 0.7 degrees Celsius. 1816 became the year without a summer — June snow in New England, food riots in Switzerland, “eighteen hundred and froze to death” on the American farms.

Lord Byron had rented the Villa Diodati on Lake Geneva for the summer. With him were his twenty-year-old personal physician John Polidori, Percy Shelley, Mary Godwin (eighteen), and Mary’s stepsister Claire Clairmont, pregnant by Byron. The cold kept them indoors. They read aloud from Fantasmagoriana, a French anthology of German ghost stories. On a cold June night Byron proposed each member of the party write a ghost story of their own.

Mary’s became Frankenstein, or the Modern Prometheus, published anonymously in 1818. Polidori’s became The Vampyre, published in 1819 — the first vampire novella in English. Its protagonist, Lord Ruthven, was modeled openly on Byron, who had bored Polidori for years. The novella was initially published under Byron’s name by mistake. It established the seductive-aristocratic vampire template that Bram Stoker would inherit eighty years later for Dracula. Two horror genres were founded in one rented Swiss villa, in one volcanic-winter June, by two writers under twenty-two, prompted by a parlor game.

Jacques Derrida published Spectres de Marx in 1993. The book opens with the famous line from the Communist Manifesto: A specter is haunting Europe, the specter of Communism. Derrida took the line literally. The ghost, on his reading, is the figure of différance — deferred presence, the not-yet-arrived and the no-longer-here, simultaneously. The ghost is not a thing that lacks being; it has its own ontological status, between being and non-being. Derrida invented a word for it: hauntologie — hauntology, a pun on ontology. The study of what haunts.

The British cultural theorist Mark Fisher picked it up in the 2000s and gave it a temporal direction. His 2014 book Ghosts of My Life argued that early-21st-century pop culture was haunted not by the dead but by lost futures — the utopian projections of the 1960s and 1970s, the promised tomorrows that the 21st century failed to deliver. The decayed-and-looped sample of an old ballroom recording (the music of Burial, the Caretaker, William Basinski) was not nostalgic. It was hauntological. The sound of a remembered future that never arrived.

Freud’s unheimlich was the past secret returning into the home. Derrida’s hauntologie is the future-that-never-was returning into the present. Same gesture, opposite temporal direction. The horror is not that the dead come back. The horror is that the future doesn’t.

A Dutch syllable that entered English in 1801 in the mouth of a fictional Albany Hans, threatening to fly after his Notchie as swift as a ghost. A German cognate Albert Einstein reached for in 1947 to dismiss the part of quantum mechanics he could not accept — which turned out, in measurement after measurement, to describe a real feature of the world. A Chinese satellite using the spooky thing to encrypt photons across a thousand kilometers. A Coventry extractor fan vibrating at 18.98 Hz, exactly at the resonance frequency of the human eyeball that NASA had measured for spaceflight comfort. A Pleistocene smoke-detector circuit calibrated for false alarms. An English word for a bad dream that is really the name of the demon medieval Europeans believed sat on sleepers’ chests. Six independent cultures whose ghosts are all young women in white. A Tokyo roboticist who drew the dip in 1970 and called it the valley of eeriness. A Parisian patient in 1923 who knew her husband’s face exactly and was sure he was not her husband. An Indonesian volcano in April 1815 that produced an indoor June 1816, which produced Frankenstein and the literary vampire. A French philosopher who said the haunting is not of the past but of the future that did not come.

Every one of them is the same shape — a presence that is not there. The brain has more than one circuit for producing it; the world has more than one way of triggering them; the word for it in English is a Dutch joke from 1801. The Halloween version of “spooky” is the least interesting one. The interesting versions are the ones being measured.