Table 2: A preliminary classification of déjà vu, déjà vécu, and involuntary memories.

Déjà vuDéjà vécuInvoluntary memories

 Mental time travel
 Characterisation“Prior occurrence”“Prior experience”“Prior episode”
 Visual images
 Source or context
 Narrative-like coherence
 A defined past
Time courseShorterLonger

Note: we would see that all these experiences should share these same characteristics; they would all be experienced involuntarily and they will all be relatively brief mental phenomena.