What could be the alien life form? is it possilbe for aliens to inhabited in our body, assimulate and take over us into other life forms? -- The film is great, you cannot imagine it was made in 1980's.
The term “gaslighting” comes from the movie, and so its definition is rather specific: when a person lies for their own gain to another person so repeatedly and with so much confidence that the victim begins to doubt her own sanity. And, as the film puts it, a bit of Stockholm Syndrome develops as well: The victim, now uncertain that she can perceive reality correctly, becomes dependent on the gaslighter, more attached to him than ever.