Qu’est-ce que la conscience, et quels sont ses mécanismes cérébraux ? (2) - S. Dehaene (2025-2026)

This lecture by Stanislas Dehaene provides a comprehensive and authoritative overview of the current state of research on non-conscious processing. Dehaene, a leading figure in cognitive neuroscience, presents a well-structured argument grounded in decades of experimental work from his own laboratory and others. The lecture is notable for its clarity in explaining complex concepts, such as subliminal priming and the global workspace theory, without oversimplifying the underlying science. The use of concrete examples, such as the ARC challenge and specific experimental paradigms, helps to illustrate abstract ideas. The argumentation is rigorous, with Dehaene carefully distinguishing between what is known empirically and what remains theoretical. He acknowledges the limitations of introspection and the need for experimental methods to probe non-conscious processes. The sources cited are primarily his own publications and those of collaborators, which is appropriate given his expertise, but it also means the lecture presents a particular theoretical perspective. While he mentions alternative views, such as those of Daniel Dennett, he does not engage deeply with critics of the global workspace theory. The lecture is highly technical, assuming a background in cognitive science, but it is accessible to an educated audience. The adéquation between title and content is excellent, as the lecture directly addresses the mechanisms of consciousness and the depth and limits of non-conscious processing. Overall, this is an excellent resource for anyone interested in the neuroscience of consciousness, offering both depth and breadth in its coverage.

The title accurately reflects the content, which focuses on the mechanisms of consciousness and specifically the depth and limits of non-conscious processing.

9/10

Lecture by a leading cognitive neuroscientist at a prestigious institution, based on decades of experimental research and peer-reviewed publications. The content is rigorous, well-structured, and grounded in empirical evidence, though it represents the author's theoretical perspective.

Markers derived by PSI from the transcript: the creator did not define chapters.

• 02:00Introduction: the iceberg metaphor and the vastness of non-conscious processing.
• 05:00Turing's machine as an example of conscious, serial processing.
• 10:00Discussion of recent AI advances, including Gemini 3 Deep Think and the ARC challenge.
• 15:00Introduction to subliminal priming and experimental paradigms.
• 20:00Evidence for non-conscious processing of words independent of physical form.
• 25:00Brain imaging results showing priming effects in the visual word form area.
• 30:00Anecdote about meeting Daniel Dennett and the question of non-conscious binding.
• 35:00Experiments on non-conscious integration of words into sentences.
• 40:00Discussion of metacognition and non-conscious error detection.
• 45:00Limits of non-conscious processing and the need for consciousness in integration.

• Collège de France - Course page — Official course page for the 2025-2026 lecture series.
• Stanislas Dehaene's chair page — Information about Dehaene's chair and related resources.
• YouTube playlist of Dehaene's lectures — Playlist containing all lectures by Stanislas Dehaene.
• Collège de France main website — General resource for lectures and research at Collège de France.

• Dehaene, S., & Changeux, J.-P. (2011). Experimental and theoretical approaches to conscious processing. — Key paper outlining the global workspace model.
• Kouider, S., & Dehaene, S. (2007). Levels of processing during non-conscious perception. — Review of levels of non-conscious processing.

• Seth, A. K. (2018). The strength of weak fish consciousness.

• www.fondation-cdf.fr
• fr.linkedin.com
• www.threads.net