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 B. Libet, C. A. Gleason, E. W. Wright, & D. K. Pearl, 1983. Time of conscious intention to act in relation to onset of cerebral activity (readiness-potential): The unconscious initiation of a freely voluntary act, Brain 106 (Pt 3): 623–642; B. Libet, 1985. Unconscious cerebral initiative and the role of conscious will in voluntary action. Behav. Brain Sci. 8: 529–566. Another lab has since found that a person’s judgment of when he intended to move can be shifted in time by giving him delayed sensory feedback of his actual movements. This suggests that such judgments are retrospective estimates based on the apparent time of movement and not based on an actual awareness of the neural activity that causes the movement (W. P. Banks & E. A. Isham, 2009). We infer rather than perceive the moment we decided to act. (Psychological Science, 20: 17–21).