Questioned about her offense by CaptainKirk, she replied "Does it matter?" She described her previous self as a "different person – malignant, hateful." Dr. Helen Noel remarked that the shifting of memory patterns was basic to psychotherapy; Dr. Adams added that patients should not be required to relive the evils committed earlier in their lives, when they were ill. (TOS: "Dagger of the Mind")
The Star Trek Encyclopedia speculates that the character was named after Lethe, meaning "Oblivion" in Greek, being the name of one of the rivers of Hades. Mythology held that souls were made to drink from this river so they would not remember their past lives when they were reincarnated.