automaton

Nick had heard her play through the very beginning of it a dozen times, until he was screaming at her in his head to go on. Well, now she did, watching her own hands busying up and down the keyboard as if they were astonishing automata that she had wound up and set in motion, in perfect synchrony, to produce this silvery flow of sound.

Due to her strict adherence to her daily schedule, Jessica was becoming more and more convinced that she was an automaton.