The problem
Sometimes a new situation feels strangely familiar, even though you know you have never been there. What creates that clash?[1]
Imagine stepping into an unfamiliar room and feeling that you have been there before, while still knowing this is your first visit. What produces that simultaneous familiarity and recognition of novelty? The question is about ordinary, nonpathological déjà vu.
A conflict account separates a memory feeling from monitoring, the evaluation of whether that feeling fits what you know. It proposes that the clash itself helps define the experience. Laboratory scene experiments can manipulate familiarity and increase feelings of prediction, but this isolates a component rather than recreating every spontaneous episode. A low-demand vigilance task also collects spontaneous reports, offering a different route to study the experience without establishing its neural cause.[1] [2] [3]
Scope
Nonpathological human déjà vu: the concurrence of felt familiarity and a judgment that the present situation is novel, including spontaneous episodes and laboratory analogues.
What remains open
Scene manipulations causally support familiarity-driven prediction feelings even without déjà-vu prompts. A 96-person vigilance study elicits spontaneous reports, and trait studies find recency associations. These task effects and correlations still leave the causal sequence of natural episodes underdetermined.[2] [3] [4]
Why it matters
The striking part is that someone can question a strong memory feeling while still having it. Explaining that separation would clarify how we judge the reliability of remembering, rather than treating strength of feeling as evidence that the situation really happened before.[1]
Mistaken recognition and déjà vu are different outcomes: in déjà vu the person notices that the feeling conflicts with what they know. A useful account must explain that preserved checking ability as well as the misleading feeling. This would connect the experience to how memory judgments can be questioned from within, rather than equating a compelling feeling with successful recall.[1] [3]
Definitions
2 terms
Familiarity
A feeling that something has been encountered before, which can occur without recall of a specific previous encounter.[1] [2]
Monitoring
Evaluating whether a memory feeling fits what you know. In a conflict account of déjà vu, this checking contributes to recognizing that the situation is new.[1]
Sources
- Towards a conflict account of déjà vu: The role of memory errors and memory expectation conflict in the experience of déjà vu
Notes on Towards a conflict account of déjà vu: The role of memory errors and memory expectation conflict in the experience of déjà vu
A narrative review frames familiarity–novelty conflict and its monitoring; it proposes an account rather than proving a complete causal mechanism.
- Experimental evidence that illusory feelings of prediction can be caused by familiarity detection
Notes on Experimental evidence that illusory feelings of prediction can be caused by familiarity detection
Three scene experiments manipulate familiarity and increase prediction feelings without asking about déjà vu. This isolates a component rather than every spontaneous episode.
- Spontaneous metacognitive experiences and involuntary memories in the laboratory
Notes on Spontaneous metacognitive experiences and involuntary memories in the laboratory
First online December 2025, January 2026 issue. A vigilance task elicits spontaneous experiences in 96 people; reported co-occurrence does not identify a neural cause.
- A hyper-recency bias in memory characterizes both psychoticism and déjà vu experiences
Notes on A hyper-recency bias in memory characterizes both psychoticism and déjà vu experiences
Two preregistered experiments associate déjà-vu traits with recency judgments. The trait association supplies neither a diagnosis nor a causal circuit.