science

Jamais vu

Jamais vu is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Jamais vu rather than just read about it. In short: In psychology, jamais vu ( ZHAM-ay VOO, US: JAHM-, French: [ʒamɛ vy]), a French loanword meaning "never seen", is the phenomenon of experiencing a situation that one recognizes in some fashion, but that nonetheless seems unusual and unfamiliar. It is often described as the opposite of déjà vu.

Key takeaways

Jamais vu belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Jamais vu to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Jamais vu from memory before moving on to harder problems.

Reference excerpt

In psychology, jamais vu ( ZHAM-ay VOO, US: JAHM-, French: [ʒamɛ vy]), a French loanword meaning "never seen", is the phenomenon of experiencing a situation that one recognizes in some fashion, but that nonetheless seems unusual and unfamiliar. It is often described as the opposite of déjà vu.

Overview Jamais vu involves a sense of eeriness and the observer’s impression of experiencing something for the first time, despite rationally knowing that they have experienced it before. Jamais vu is commonly explained as when a person momentarily does not recognize a word or, less commonly, a person or place, that they already know. Jamais vu is sometimes associated with certain types of aphasia, amnesia, and epilepsy.

Experiment A study by Chris Moulin of Leeds University asked 92 volunteers to write out "door" 30 times in 60 seconds. He reported that 68 percent of volunteers showed symptoms of jamais vu, such as beginning to doubt that "door" was a real word. Moulin believes that a similar brain fatigue underlies some symptoms of schizophrenia and Capgras delusion. Moulin suggests that people with these conditions could be suffering from chronic jamais vu.

Causes Jamais vu can be caused by epileptic seizures.

Related phenomena Déjà vu: having the strong sensation that an event or experience being experienced, has already been experienced in the past, whether it has actually happened or not. In French, this means 'already seen'. Tip of the tongue/Presque vu: almost, but not quite, remembering something.

See also Capgras delusion (the delusion that a friend or relative is an impostor) Cryptomnesia Depersonalization derealization disorder Derealization Mandela effect Semantic satiation Uncanny

References

Further reading Sno, Herman N. (2000). "Déjà vu and jamais vu". In Berrios, German E.; Hodges, John R. (eds.). Memory Disorders in Psychiatric Practice. Cambridge University Press. pp. 338–347. doi:10.1017/CBO9780511530197.016. ISBN 978-0-521-57671-0. Cheng, Lionel Tim-Ee; Chan, Lai Peng; Tan, Ban Hock; Chen, Robert Chun; Tay, Kiang Hiong; Ling, Moi Lin; Tan, Bien Soo (June 2020). "Déjà Vu or Jamais Vu? How the Severe Acute Respiratory Syndrome Experience Influenced a Singapore Radiology Department's Response to the Coronavirus Disease (COVID-19) Epidemic". American Journal of Roentgenology. 214 (6): 1206–1210. doi:10.2214/AJR.20.22927. PMID 32130047. S2CID 212417312. Burwell, Rebecca D; Templer, Victoria L (September 2017). "Jamais vu all over again". Nature Neuroscience. 20 (9): 1194–1196. doi:10.1038/nn.4625. PMC 6101242. PMID 28849788. Moulin, Chris J. A.; Bell, Nicole; Turunen, Merita; Baharin, Arina; O’Connor, Akira R. (9 August 2021). "The the the the induction of jamais vu in the laboratory: word alienation and semantic satiation". Memory. 29 (7): 933–942. doi:10.1080/09658211.2020.1727519. hdl:10023/21466. PMID 32079491. S2CID 211231684. "Jamais Vu". The Deja Vu Experience. 2004. pp. 115–124. doi:10.4324/9780203485446-13. ISBN 978-0-203-48544-6. Struck, Terry H. (June 2002). "Jamais vu episodes in relationship to baclofen treatment: A case report". Archives of Physical Medicine and Rehabilitation. 83 (6): 846–849. doi:10.1053/apmr.2002.32828. PMID 12048665. Marcial, Dennis (9 September 2016). "Jamais Vu". The Quiet Corner Interdisciplinary Journal. 1 (2). Ullian, John A.; Matson, Christine C. (March 2001). "The 'Jamais-vu Phenomenon' in Medical Education". Academic Medicine. 76 (3): 217. doi:10.1097/00001888-200103000-00004. PMID 11242567.

Worked examples

Example 1 — a first encounter with Jamais vu

Start with the simplest possible case. Write down what Jamais vu claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Jamais vu before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Jamais vu ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Jamais vu

In research: Jamais vu appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Jamais vu in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Jamais vu is common in secondary-school and first-year university syllabi. It links to neighbouring topics Perception, Semiotics, Semiotics stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Jamais vu outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Jamais vu in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Jamais vu means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Jamais vu out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Jamais vu in simple terms?

Why does Jamais vu matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Jamais vu?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Jamais vu.