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Human will often operates under the radar of conscious awareness. This project explores the biological basis of this “unconscious will”. The crucial role of the human reward circuitry in response to rewarding stimuli that are presented below the threshold of conscious awareness (i.e., subliminally) will be probed: Is flexible and effortful action in response to such subliminal stimuli linked to activation of the ventral striatum reflecting the reward value of the action outcome and does this depend on individual brain differences in reward sensitivity? The findings may result in a new way of looking at disturbances in the fluency and efficiency of behaviour so typical for clinical conditions that are associated with dysfunctional reward circuits.