WP4 develops one of the proposal’s main goal of understanding the limits of unconscious learning. Specifically, its two objectives are (1) to determine if the development of unconscious structural knowledge of a domain (implicit learning) requires conscious perception of the stimuli; and (2) if unconscious knowledge can be developed of symmetries, i.e. of regularities that go beyond statistical associations. The two issues that define the field of implicit learning are 1) the role of consciousness in learning and 2) the contents of what can be learned without awareness. The two objectives of WP4 thus correspond to the two main issues that define the field.