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ESP Believers: Less Random Than You Think?

Peter Brugger, Théodor Landis, Marianne RegardBritish Journal of Psychology, 1990 Peer-Reviewed
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✦ Imagine …

Do ESP believers think differently about randomness than skeptics?

Imagine you're taking a telepathy test, trying to guess cards your partner is looking at across the room. You get a heart, then another heart — and suddenly you think 'No way, it can't be hearts again!' So you guess spades instead. Swiss researchers discovered something fascinating: people who believe in ESP avoid repetitive guesses far more than skeptics do, even when repetition is perfectly normal by chance. This pattern showed up not just in telepathy experiments, but whenever believers tried to create 'random' sequences. Could our intuitions about randomness be secretly shaping what we think are psychic experiences?

ESP believers avoid repetitions more, suggesting psychological rather than psychic explanations.

Swiss researchers noticed something curious about people who believe in ESP versus those who don't. When both groups participated in telepathy experiments, their response patterns differed in unexpected ways. This led to a deeper investigation into how belief in the paranormal might influence how we perceive randomness itself.

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People who believe in ESP have fundamentally different intuitions about randomness than skeptics — they expect fewer repetitions and coincidences than actually occur by chance.

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Key Findings

  • In all three experiments, ESP believers consistently avoided repetitions much more than skeptics did.
  • When generating random numbers, believers rarely picked the same number twice in a row.
  • When estimating repetitions in random sequences, believers consistently underestimated how many repetitions should naturally occur by chance.

What Is This About?

The researchers conducted three experiments. First, they looked back at telepathy test data to see how believers and skeptics answered multiple choice questions. Then they had people generate random sequences of numbers from 1 to 6, like rolling dice. Finally, they showed participants short random sequences and asked them to estimate how many repetitions they contained. Throughout all tests, they compared how ESP believers ('sheep') and non-believers ('goats') handled randomness.

Methodology

Researchers analyzed how believers vs. non-believers in ESP generate random sequences and perceive randomness in three different experiments.

Outcomes

ESP believers consistently avoided repetitions more than non-believers when generating random sequences and underestimated expected repetitions in random data.

How Good Is the Evidence?

#

While specific numbers aren't provided, the consistent pattern across three different experiments suggests a robust psychological difference in how the two groups perceive randomness.

Anecdotal15/100
AnecdotalPreliminarySolidStrongOverwhelming
✓ What supports it?

This study was not pre-registered and used retrospective analysis for one experiment. No blinding was reported, and it appears to be observational rather than controlled. Sample sizes are not specified in the abstract. Statistical significance was reported but no effect sizes. The data does not appear to be publicly available. The study has not been directly replicated but was published in a reputable psychology journal. The research provides valuable insights into psychological factors affecting ESP research.

✗ What are the concerns?

The study lacks specific sample sizes, effect sizes, and statistical details, making replication difficult. The connection between randomness perception and actual ESP performance remains theoretical. The experiments don't directly test ESP abilities but only cognitive biases related to belief.

↔ Interpretation Spectrum

Mainstream: This demonstrates that ESP effects are likely artifacts of psychological differences in probability perception rather than genuine psychic abilities. Moderate: The findings suggest important confounding factors in ESP research that need to be controlled for, but don't definitively rule out psychic phenomena. Frontier: Psychological differences between believers and skeptics might actually facilitate or inhibit genuine ESP abilities, making belief a necessary component of psychic functioning.

Common Misconception

Misconception: This study proves ESP doesn't exist. Reality: The study suggests that some apparent ESP effects might be explained by how believers and skeptics differently perceive randomness, but doesn't definitively disprove ESP itself.

Convincing Checklist
2 of 5 criteria met
Met2/5
Large sample (N>100)
Peer-reviewed journal
Replicated
Significant effect
DOI available

To settle this question, we'd need large-scale, pre-registered studies that control for randomness perception while testing ESP, plus replication across multiple labs. This study meets the criterion of identifying an important confounding variable but lacks the controlled methodology needed for definitive conclusions.

This may indicate that believers are more prone to an illusion of causality in the face of everyday coincidences.

Stance: Skeptical

What Does It Mean?

The most striking finding? Believers and skeptics literally live in different probabilistic worlds — what seems random to one group feels suspiciously patterned to the other. This suggests our beliefs about the impossible might be shaped by something as basic as how our brains process coincidence.

Think about flipping a coin - most people expect heads and tails to alternate, but true randomness often includes streaks like three heads in a row. This study suggests ESP believers have an even stronger expectation that random events should 'look random' without repetitions.

Wonder Score
4/5
Astonishing
💭 If this is true — what does it mean for us?
If robust, these findings suggest that belief systems fundamentally alter how we process probability and randomness, potentially affecting decision-making and pattern recognition. This could indicate that consciousness and belief actively shape our perception of reality's statistical structure.
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Science Literacy Tip

This study illustrates how psychological factors can masquerade as the phenomenon being studied, highlighting the importance of controlling for participant beliefs and cognitive biases in any research.

Understanding Terms

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Sheep-Goat Effect
The tendency for ESP believers ('sheep') to score differently than skeptics ('goats') in psychic experiments
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Subjective Randomness
How random a sequence appears to human perception, often differing from mathematical randomness
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Repetition Avoidance
The psychological tendency to avoid consecutive identical responses when trying to be random

What This Study Claims

Findings

ESP believers ('sheep') avoided repetitive responses significantly more than non-believers ('goats') in telepathy experiments

moderate

Believers in ESP underestimated the number of mathematically expected repetitions in random sequences significantly more than skeptics

moderate

Interpretations

Believers may be more prone to illusions of causality when encountering everyday coincidences

weak

The sheep-goat effect may be explained by differences in subjective probability judgments rather than genuine ESP abilities

moderate

Implications

Subjective probability effects should be considered in future ESP studies to account for individual differences

moderate

This summary is for general information about current research. It does not constitute medical advice. The scientific interpretation of these results is debated among researchers. If personally affected, please consult qualified professionals.