Déjà vu
Déjà vu was the term – from the French language for "already seen" – used to describe the experience of feeling that the current situation had occurred before. The corresponding term in Klingonese was "nIb'poH." Tuvok referred to the phenomenon as a "paradoxical state-dependent associative phenomenon."  The experience of déjà vu was also associated with the phenomenon of alternate realities. (; ; )

In 2364, Geordi La Forge described an incident aboard the  when a moment in time repeated itself as a feeling of déjà vu. ()

In 2368, the explosion of the warp core of the Enterprise next to a highly localized temporal distortion triggered a temporal causality loop. The loop made the crew of the Enterprise relive the same twenty-hours over and over again inside an independent fragment of time. Every time the loop repeated, the memories of the crew "reset" until eventually memories from previous loops began to imprint themselves to the persons inside the loop, manifesting first in a form similar to the feeling of déjà vu. () 

In 2373, Ensign Harry Kim claimed that the  had already visited the Taresian homeworld. Kim felt an alternate reality might explain the intense sense of déjà vu regarding the region of space in the Delta Quadrant, until a Taresian retrovirus was found to be the actual cause of the unexplained memories in his brain. ()

In 2374, Kathryn Janeway said "Déjà vu" when she and Seven found themselves in the "" brig, as they had nine months before aboard Voyager. ()

In 2378, Admiral Janeway asked if she were "the only one experiencing déjà vu" when her younger self strove to find a way to destroy a transwarp hub rather than use it to get Voyager home. The Admiral considered this situation paralleled Captain Janeway's decision of seven years before to destroy the Caretaker's array. ()

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Psychological conditions