Terminator 2 Judgment Day CPU Reset Extended Deleted Scene.

Van Ling (Creative Supervisor), in T2, the Book of the Film, An Illustrated Screenplay:
One of the major lifts from the film was the entire head operation scene. The scene had been shot in its entirety and edited in, but was ultimately deemed unnecessary to the plot and was cut for time. To explain Terminator's ability to use human expressions later in the film, a bridging line of dialogue for Terminator was added in postproduction: "The more contact I have with humans, the more I learn."