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(covers information from several alternate timelines)
In 2153 of an alternate timeline, Captain Jonathan Archer's hippocampus was infected by interspatial parasites which prevented him from forming any new long-term memories. As a result, Archer woke up each day with no memories since his initial infection. Doctor Phlox designed a treatment using a subspace implosion to remove the parasites. After being removed, the parasites were erased from history, leaving Archer with no memory of their existence. (ENT: "Twilight")
Tampering by solanogen-based lifeforms caused elevated levels of serotonin to concentrate in the hippocampus of several crewmembers of the USS Enterprise-D. Doctor Beverly Crusher realized that this was caused by a neuro-sedative used by the aliens to sedate the victims they experimented on. (TNG: "Schisms")
In an alternate version of 2370 created by Q, Captain Jean-Luc Picard traveled back and forth through time. After one of these jumps, Doctor Crusher discovered a 13% increase of the acetylcholine level in his hippocampus, suggesting he had accumulated two days worth of memories within a matter of minutes. (TNG: "All Good Things...")
In 2372, after changing his identity to free him from his exile from the Klingon Empire, Julian Bashir told "Rodek" that his hippocampus had been affected by a plasma discharge and was causing amnesia. (DS9: "Sons of Mogh")