The Familiarity That Feels Unearned

The Glitch Feeling

Sometimes a moment arrives with an impossible label: I know this already. Déjà vu is one familiar version. A 2026 study in the Journal of Psychoactive Drugs asked whether a similar feeling during psychedelic experiences actually resembles ordinary autobiographical familiarity or déjà vu.

Researchers used an anonymous online survey of 1,050 participants. People completed a familiarity questionnaire and emotional ratings for at least one of three experience types: psychedelic, autobiographical or déjà vu. The psychedelic reports scored higher on familiarity measures, particularly those involving what the authors call transcendent features. They also received higher ratings for emotional intensity, novelty and comfort in these comparisons.

What the Study Can—and Cannot—Show

This was a comparison of self-reported experiences, not a controlled experiment inducing identical states in a lab. Most participants described their psychedelic familiarity as authentic and positively impactful; about half reported enduring effects such as emotional change or interconnectedness. Those are reports, not proof that a substance caused lasting benefit.

• Compared: the felt quality of three kinds of familiarity.
• Not measured: a person predicting the future or recovering an objectively hidden memory.
• Not established: a neural mechanism that explains every déjà vu episode.

Why It Matters

A strong feeling of recognition does not, by itself, tell us where recognition came from. The authors suggest psychedelic familiarity may be phenomenologically distinct from everyday memory and déjà vu, and call for further investigation of its possible role in longer-term effects. JitterSnap’s interpretation is simpler: a sense of certainty can feel like evidence even when the study is measuring only the sensation.

The experience can be real without its first explanation being right.