The inner life
Threat Simulation Theory
Direct answer
Threat Simulation Theory: Threat simulation theory, proposed by Antti Revonsuo in 2000, holds that dreaming evolved as a rehearsal space where the sleeper practises recognising and escaping danger.
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At a glance
- Also called
- Revonsuo threat simulation, evolutionary theory of dreaming, why do we dream of being chased, threat simulation hypothesis
- Found in
- Consciousness & Spiritual Psychology
- Related
- Nightmare, Recurring Dream, Oneirology, Continuity Hypothesis
Threat simulation theory, proposed by Antti Revonsuo in 2000, holds that dreaming evolved as a rehearsal space where the sleeper practises recognising and escaping danger.
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What is threat simulation theory?
The theory starts from a count. Dreams contain far more threats, such as pursuit, attack, accidents and failures, than waking life does, and the dreamer usually responds sensibly, by fleeing, hiding or fighting. Revonsuo argued that this is the function showing through. In the dangerous world of early humans, a mind that rehearsed threats every night would meet real ones a little better prepared, and so the habit was selected.
Threat Simulation Theory predicts that real danger switches the system on harder, and that the threats dreamt tend to be ancestral in kind. Critics reply that many dreams hold no threat at all, that the rehearsals are often unrealistic, and that a benefit to survival has not been shown.
On the tree of the hidden arts: Dreams.
What sets Threat Simulation Theory apart
Unlike most dream theories this one makes claims that can be counted against data: how often threats occur, who the target is, how the dreamer reacts, and whether real danger raises the rate. That is its strength and its exposure. Revonsuo treats the dream as a simulation in the strict sense, a virtual world with a self in it, and argues that its content is too organised and too selective to be random noise from the brainstem.
- Author: Antti Revonsuo, University of Turku
- Published: Behavioral and Brain Sciences, 2000
- Core claim: dreaming was selected for as rehearsal of threat perception and avoidance
- Field test: Valli and colleagues, 2005: traumatised and non-traumatised children compared
- Later extension: social simulation theory, 2015
Often mistaken for something else: The continuity hypothesis says dreams mirror waking concerns in general; threat simulation says they select the dangerous ones and rehearse a response.
The story behind Threat Simulation Theory
The Finnish philosopher and neuroscientist Antti Revonsuo set the theory out in Behavioral and Brain Sciences in 2000, under the title The Reinterpretation of Dreams. In 2005 Katja Valli and colleagues reported that Kurdish children who had lived through violence dreamt of more, and more severe, threats than Finnish children who had not. Revonsuo and his colleagues later proposed a wider social simulation theory.
Why Threat Simulation Theory matters
Threat Simulation Theory offers an answer in evolutionary terms to an old puzzle, why so many dreams are unpleasant, without calling them symbols.
How to read Threat Simulation Theory
Readers reach for it with chase and attack dreams, asking what danger the dream is rehearsing before asking what it stands for.
Threat Simulation Theory in practice: an example
A new driver dreams of brakes that fail on a hill and of steering onto the verge; the theory calls that a drill.
Where readings of Threat Simulation Theory go wrong
Threat Simulation Theory is one hypothesis among several and remains contested; it explains why threats are common in dreams, not what any one dream means.
Sources and editorial method
This entry summarizes the tradition in the Almanac's own words; where no source is listed, it is an editorial summary rather than a primary text, and symbolic readings are named as the tradition's, not as fact.
- Source
- The Great Almanac Dictionary
- Category
- Consciousness & Spiritual Psychology
- Aliases
- threat simulation theory of dreams, Revonsuo threat simulation, evolutionary theory of dreaming, why do we dream of being chased, threat simulation hypothesis
- Last updated
- 2026-09-26
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Common questions
What is threat simulation theory?
An evolutionary account of dreaming. It proposes that dreams simulate threatening events so that the dreamer rehearses perceiving and avoiding danger, and that this rehearsal aided survival.
Who developed threat simulation theory?
Antti Revonsuo, a Finnish cognitive neuroscientist, who published it in the journal Behavioral and Brain Sciences in 2000. Katja Valli has carried out much of the testing.
What evidence supports threat simulation theory?
Content studies find threats over-represented in dreams, and children exposed to real violence report more threatening dreams. Against it, a large share of dreams contain no threat, and nobody has shown that dream rehearsal improves waking performance.
