Déjà Vu (or Deja Vu) is defined as as any sudden inappropriate impression of familiarity of a present experience with an undefined past. Its two critical components are an intense feeling of familiarity, and a certainty that the current moment is novel. This term is a common phrase from the French language which translates literally into “already seen”. It is a well-documented phenomenon that can commonly occur throughout both sober living and under the influence of hallucinogens.
Within the context of psychoactive substance usage, many compounds are commonly capable of inducing spontaneous and often prolonged states of mild to intense sensations of déjà vu. This can provide one with an overwhelming sense that they have “been here before”. The sensation is also often accompanied by a feeling of familiarity with the current location or setting, the current physical actions being performed, the situation as a whole, or the effects of the substance itself.
This effect is often triggered despite the fact that during the experience of it, the person can be rationally aware that the circumstances of the “previous” experience (when, where, and how the earlier experience occurred) are uncertain or believed to be impossible.
Déjà vu is often accompanied by other coinciding effects such as olfactory hallucinations and derealization. It is most commonly induced under the influence of moderate dosages of hallucinogenic compounds, such as psychedelics, cannabinoids, and dissociatives.
It is worth noting that the experience of Déjà vu is extremely common in people who are completely sober. For example, a 2003 review found that roughly two-thirds of the general population have had déjà vu experiences. Other studies confirm that déjà vu is a common experience in healthy individuals, with between 60% and 70% of individuals reporting it, particularly within those who are between the ages of 15 and 25.
Scientific explanations of déjà vu typically conclude that this state of mind is as an anomaly of memory, which creates the distinct impression that an experience is "being recalled" when it is actually occurring within the present moment. This explanation is supported by the fact that the sense of "recollection" at the time is strong in most cases, but the circumstances of the "previous" experience (when, where, and how the earlier experience occurred) are believed to be improbable or impossible.
Compounds within our psychoactive substance index which may cause this effect include:
- Psilocybin mushrooms
Annectdotal reports which describe this effect with our experience index include:
- Experience:10mg & 20mg Intravenous DPT HCl - Familiar Shapes, Experiencing Death, Immersed in The Light
- Experience:2 hits of LSD + weed - Mindfuck
- Experience:3 Grams of Mushrooms - Reset on my Life, Experiencing Satori and the Cosmic Perspective
- Experience:300μg 1P-LSD + 40mg diphenidine - My first psychotic break
- Experience:4-HO-DET (20 mg, oral) - Tripping for my birthday
- Experience:Mushrooms and Snuff Films -- Trip Report (3.5 grams)
- Responsible use
- Subjective effects index
- Psychedelics - Subjective effects
- Dissociatives - Subjective effects
- Deliriants - Subjective effects
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