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Tuesdays at Espace des sciences with Stanislas Dehaene, cognitive psychologist, professor at the Collège de France, member of the Academy of Sciences. Is our conscious experience reduced to the activity of our neurons? What are the powers and limits of the unconscious? Far from being unapproachable, these questions are today at the heart of research in cognitive neuroscience. Brain imaging methods, combined with experimental paradigms from cognitive psychology, make it possible to visualize all the brain operations that make us perceive a face, a word or a sentence. It becomes possible to identify "signatures" of consciousness - neuronal markers whose presence indicates awareness. The application of this research in the clinic, in comatose patients, in a vegetative state or minimally conscious, opens up new perspectives for understanding and even simulating what consciousness is.