The science of the paranormal

• A. Claims are accepted when they are widely believed by experts
• B. Claims are tested through observation and experiment, and must be falsifiable ✓
• C. Claims are accepted when they are supported by personal testimony
• D. Claims are accepted when they align with traditional cultural beliefs

Why: The scientific method relies on empirical testing and falsifiability: a claim must be stated in a way that could be proven wrong by evidence. Popularity, authority, and tradition alone do not establish truth.

• A. Personal accounts are always deliberately false
• B. Memory, perception, and expectation can be unreliable and are hard to verify or reproduce ✓
• C. Only written evidence can ever be considered valid
• D. Anecdotes are scientifically proven to be impossible

Why: Human perception and memory are reconstructive and influenced by expectation, stress, and suggestion. Anecdotes cannot be independently checked or repeated under controlled conditions, so they are weak evidence even when sincerely reported.

• A. The claim is printed in many textbooks
• B. Independent researchers can repeat the test and obtain the same results ✓
• C. The claim was first proposed by a famous scientist
• D. The claim can be explained using everyday language

Why: Reproducibility means that independent investigators, following the same procedure, get consistent results. A single unrepeatable observation cannot reliably establish a phenomenon.

• A. A group of believers who are asked to predict the outcome
• B. A group that does not receive the tested intervention, used as a baseline for comparison ✓
• C. The group of researchers who design the experiment
• D. A group that is guaranteed to show the effect

Why: A control group does not receive the treatment being tested, so researchers can determine whether observed effects exceed what would happen by chance, expectation, or other factors alone.

• A. The skeptic must prove the claim is false
• B. The person making the claim is responsible for providing sufficient evidence ✓
• C. Both sides must share equal responsibility for evidence
• D. No evidence is needed if the claim is interesting

Why: The burden of proof rests on the person asserting a claim. Extraordinary claims, which contradict well-established knowledge, require correspondingly strong evidence, as summarized by the principle that extraordinary claims require extraordinary evidence.

• A. A rare neurological condition that causes permanent hallucinations
• B. The brain's tendency to perceive meaningful patterns, such as faces, in ambiguous visual stimuli ✓
• C. A type of electromagnetic field detected by sensitive individuals in haunted locations
• D. A memory disorder that causes people to confuse past events with dreams

Why: Pareidolia is the tendency of the brain to impose familiar patterns, especially faces, onto vague or random stimuli like clouds, electrical outlets, or shadows. It is a well-documented perceptual process and a common explanation for apparent ghostly faces in photographs.

• A. Confabulation
• B. Synesthesia
• C. The sensed presence ✓
• D. Cryptomnesia

Why: The 'sensed presence' is a feeling that someone is nearby when no one is there. It is commonly reported during the transition into or out of sleep, and researchers link it to disrupted signals between the brain's sleep and waking systems, which can also produce hallucinations and paralysis.

• A. Preparing physical equipment before an investigation
• B. Exposure to a suggestion or expectation that shapes how a later experience is interpreted ✓
• C. A method of contacting spirits through repeated chanting
• D. The gradual loss of memory about a traumatic event

Why: Priming occurs when prior information or expectations influence how ambiguous experiences are perceived. Someone told a building is haunted is more likely to interpret creaks, drafts, or shadows as paranormal, which is why controlled studies often blind participants to the location's reputation.

• A. Witnesses are always deliberately lying about their experiences
• B. Human memory is reconstructive and susceptible to suggestion, expectation, and stress ✓
• C. Only children are capable of accurately perceiving the supernatural
• D. Ghosts only appear to people who have never heard of them

Why: Memory is not a perfect recording but is rebuilt each time it is recalled, making it vulnerable to distortion from expectations, emotion, and leading questions. Anecdotes can be sincere yet still unreliable, which is why scientific claims require controlled, repeatable evidence.

• A. Ghosts are more active in darkness
• B. Low light reduces visual detail, giving the brain more room to fill in gaps with imagined shapes ✓
• C. Darkness causes the eyes to emit a faint glow
• D. Electromagnetic fields are strongest after sunset

Why: In dim conditions the visual system receives less precise information, so the brain relies more on prior expectations and pattern completion. Peripheral vision and movement detection also become less reliable, making shadows and motion more easily misread as figures.

• A. A Geiger counter; it detects radiation, which ghosts are known to emit
• B. An EMF meter; it detects electromagnetic fields, but common household wiring and electronics produce fields that can easily cause false readings ✓
• C. A thermocouple; it proves ghosts are cold, but only in dark rooms
• D. A spectrometer; it identifies the chemical signature of spirits

Why: EMF meters measure electromagnetic field strength, which is real and measurable. However, ordinary sources such as wiring, appliances, phones, and power lines routinely produce fields, so an EMF spike alone does not indicate a supernatural presence. Controlled investigation requires ruling out these mundane sources.

• A. Thermometers cannot measure temperatures below room temperature
• B. Drafts, air conditioning, open windows, and uneven heating can all create localized temperature drops ✓
• C. Ghosts absorb heat only when photographed
• D. Cold spots are measured in kelvin, which is not used in buildings

Why: Temperature varies naturally within a room due to airflow, insulation, sunlight, and HVAC systems. A cold spot is a real physical measurement, but it has many ordinary explanations, so investigators must document airflow and compare readings over time before attributing them to anything unusual.

• A. To increase the battery drain, which attracts spirits
• B. So that one device's results can be cross-checked against the others, helping to distinguish real events from equipment malfunction or perception ✓
• C. Because the law requires three recordings for legal evidence
• D. To ensure the ghost appears in at least one frame

Why: Independent recordings allow comparison. If an anomaly appears on only one device, it may be a glitch or a artifact of that device. If several independent instruments record the same event at the same time, the case for a genuine external cause is stronger, though it still must be checked against ordinary explanations.

• A. A type of camera lens that distorts images, causing false shadows
• B. The human tendency to perceive meaningful patterns, such as voices or faces, in random noise, which can lead investigators to hear words that are not actually there ✓
• C. A battery malfunction that produces static only at night
• D. A measurement unit for electromagnetic interference

Why: Pareidolia causes people to find familiar patterns in ambiguous stimuli. In EVP (electronic voice phenomenon) recordings, which are full of static and background noise, listeners often hear words or voices that other listeners do not. This is why rigorous studies use blind listening tests and multiple independent listeners.

• A. Recording only the moments when something unusual happens and discarding the rest
• B. Establishing a baseline reading of normal conditions, then comparing anomalies against it, and documenting negative results as well ✓
• C. Using only one instrument that has previously produced a positive result
• D. Interpreting every unexplained sound as evidence before checking for ordinary causes

Why: A baseline shows what normal readings look like in a given location, so anomalies can be identified meaningfully. Recording negative results, too, prevents selective reporting, which is one of the most common ways that anecdotal evidence becomes misleading.

• A. The cerebellum, which coordinates balance and fine motor movement
• B. The temporal lobes, which are involved in memory and sensory processing ✓
• C. The medulla oblongata, which controls heart rate and breathing
• D. The corpus callosum, which connects the two cerebral hemispheres

Why: The temporal lobes, particularly areas involved in memory and sensory integration, have been implicated in studies where stimulation or abnormal activity produced vivid memories and sensations. This is one reason researchers propose they may contribute to NDE-like content, though the link remains a hypothesis.

• A. Cortical spreading depression ✓
• B. Sleep spindle activity
• C. Alpha wave suppression
• D. Ictal discharge

Why: Cortical spreading depression is a slow wave of neuronal depolarization that can spread across the cortex. Some researchers have proposed it as a mechanism during dying, though direct evidence linking it to NDE content in humans is limited.

• A. Serotonin
• B. Glutamate via NMDA receptors ✓
• C. Acetylcholine
• D. Dopamine in the nigrostriatal pathway

Why: NMDA receptor antagonists such as ketamine can produce dissociation, feelings of detachment, and tunnel-like or out-of-body sensations. This pharmacological parallel is one reason glutamate dysregulation is studied in relation to NDEs.

• A. NDEs never involve any measurable brain activity
• B. Cardiac arrest is rare, and recording brain activity during it is technically and ethically difficult ✓
• C. All NDE reports are identical, making comparison impossible
• D. Brain scanners cannot detect electrical activity

Why: Cardiac arrest events are unpredictable and brief, and recording the brain in these circumstances requires prepared equipment and consent-based protocols. Small sample sizes and retrospective self-reports further limit conclusions.

• A. Because the brain is completely inactive during all NDEs
• B. Because NDE features can be reproduced by hypoxia, anesthesia, drugs, and direct brain stimulation, suggesting they arise from brain processes ✓
• C. Because NDE reports are always recorded after the patient has fully recovered and forgotten details
• D. Because all patients who report NDEs were in a coma

Why: Hypoxia, anesthetics, psychedelics, and electrical stimulation of specific brain areas can all generate tunnel sensations, light, life-review-like memories, and out-of-body perceptions. This shows the experiences can be produced by brain states, though it does not by itself rule out other interpretations.

• A. 1 in 2
• B. 1 in 5 ✓
• C. 1 in 10
• D. 1 in 25

Why: With five equally likely symbols, each guess has a 1/5 (20%) probability of being correct by chance alone. Researchers compare observed hit rates against this baseline to see whether results exceed chance.

• A. To make the test more entertaining for participants
• B. To ensure targets are unpredictable so that guessing patterns cannot be exploited ✓
• C. To increase the number of correct answers
• D. To eliminate the need for a control group

Why: If targets follow a predictable sequence, a participant could succeed through pattern recognition or inference rather than extrasensory means. Randomization ensures each target is unpredictable, isolating any true effect from such artifacts.

• A. To ensure the participant is unaware of the test's purpose
• B. To prevent both the experimenter and participant from unintentionally cueing or influencing responses ✓
• C. To double the number of trials conducted
• D. To verify that the participant has taken the test twice

Why: In a double-blind design, neither the person interacting with the participant nor the participant knows the target during the trial. This prevents unintentional cues such as facial expressions, tone, or handling of materials from producing apparent hits.

• A. Performance is well below chance and suggests a strong negative ESP effect
• B. Performance is at chance, since 20 correct guesses would be expected
• C. Performance is above chance, since 20 correct guesses would be expected, but statistical testing is needed to judge whether 30 is significantly higher ✓
• D. The result proves ESP exists because it exceeds 25 hits

Why: Chance expectation is 20 hits in 100 trials, so 30 is above chance. However, a single above-chance result does not establish significance by itself; a binomial or chi-square test is needed to determine whether the excess is unlikely under chance alone, and even then it does not prove ESP without ruling out methodological flaws.

• A. It guarantees that the results will be statistically significant
• B. It reduces the risk of post hoc selection of favorable outcomes, such as choosing only the best-performing subsets of data ✓
• C. It allows the experiment to run without a control condition
• D. It makes the data collection process faster

Why: Without a fixed analysis plan, researchers may test many variables or subsets and report only those that look significant, inflating false positives. Pre-registration commits the analysis in advance, making apparent effects more trustworthy.

• A. A fossilized species that has been formally documented by paleontologists
• B. An animal reported by people but not yet confirmed by scientific evidence ✓
• C. A species that was declared extinct and later rediscovered in a lab
• D. A mythological creature that appears only in ancient literature

Why: A cryptid is an animal that is claimed or reported to exist but lacks accepted scientific confirmation, such as Bigfoot or the Loch Ness monster. The term does not imply the animal is real or fictional, only that its existence is unverified.

• A. A preserved physical specimen that can be genetically tested
• B. Repeated eyewitness sightings from people with no shared motive
• C. A single blurry photograph or video with no verifiable context ✓
• D. Confirmed footprints analyzed by a team of zoologists

Why: A single blurry photo or video is easily faked, misidentified, or altered, and it cannot be independently verified. Physical specimens and expert analysis carry much more evidentiary weight than ambiguous visual media.

• A. Witnesses are always lying about what they saw
• B. Human perception and memory are prone to error, expectation bias, and suggestion ✓
• C. Sightings can only occur at night, when vision is impaired
• D. Eyewitnesses are legally prohibited from testifying about animals

Why: Research in cognitive psychology shows that perception and memory are reconstructive and susceptible to expectation and suggestion. Witnesses are usually sincere, but sincere observations can still be mistaken, especially in poor visibility or under stress.

• A. Large animals never leave any biological traces behind
• B. Scientists are forbidden from studying animals in remote regions
• C. Wild animals are typically elusive, rare, and leave few verifiable traces such as bodies or DNA ✓
• D. Modern technology cannot detect any animal larger than a rodent

Why: Many real animals were long unconfirmed because they are rare, elusive, and live in remote habitats. The absence of a body or clear evidence does not prove nonexistence, but it also means positive claims require strong evidence to be accepted.

• A. A consensus of people in a local community who all reported the same sighting
• B. A museum-quality physical specimen, such as a body or tissue, that can be examined and genetically sequenced ✓
• C. A dramatic video recorded by a documentary crew
• D. A historical legend passed down through several generations

Why: A physical specimen can be examined by independent experts, measured, dated, and genetically sequenced, allowing its identity to be tested and reproduced. This is why the scientific community treats specimens as the gold standard over anecdotes or media.

• A. Confirmation bias ✓
• B. Hindsight bias
• C. Availability heuristic
• D. Dunning-Kruger effect

Why: Confirmation bias is the tendency to seek, interpret, and remember information that supports existing beliefs while discounting contradictory evidence. Vague predictions that happen to match experiences get remembered as accurate, while failed predictions are quickly forgotten.

• A. Apophenia ✓
• B. Anchoring
• C. Groupthink
• D. Survivorship bias

Why: Apophenia is the tendency to perceive connections or meaningful patterns in random data. It helps explain why people report seeing images in clouds, hearing messages in static, or finding hidden meaning in coincidences.

• A. People rating vague, general personality descriptions as highly accurate for themselves ✓
• B. People overestimating their own intelligence
• C. Memories being reconstructed after the fact to match current beliefs
• D. Groups adopting extreme positions after discussion

Why: The Barnum (or Forer) effect shows that people readily accept broad, flattering, and ambiguous statements as uniquely true of themselves. Psychics and horoscopes often rely on this effect to seem accurate.

• A. Because they are transmitted through social learning, reinforced by community norms, and tied to identity and emotional meaning ✓
• B. Because all cultures have been exposed to the same controlled experiments
• C. Because the human brain is physically incapable of updating beliefs
• D. Because paranormal phenomena are regularly confirmed by scientific instruments

Why: Beliefs are learned from family, peers, and media, and they persist because they provide comfort, community belonging, and explanations for loss or uncertainty. Social reinforcement makes them resistant to change regardless of the evidence.

• A. Survivorship bias ✓
• B. Framing effect
• C. Bandwagon effect
• D. Sunk cost fallacy

Why: Survivorship bias occurs when we focus on the cases that passed a selection process while ignoring those that did not. Successful psychics receive attention, while the far larger number of failed predictions go unreported, inflating the apparent success rate.