Global Workspace Theory

Global Workspace Theory (GWT), developed by cognitive neuroscientist Bernard Baars and extended computationally by Stanislas Dehaene and colleagues, holds that conscious experience arises when information is broadcast widely across the brain — made available to a diverse set of specialized, otherwise independent processors. The 'global workspace' is the broadcasting architecture: a central, high-bandwidth channel that allows local specialists (sensory cortices, memory systems, motor planning) to share information and coordinate behavior.

GWT elegantly accounts for the signature features of conscious experience: its limited capacity (only a small amount of information is conscious at once), its broadcast character (once something is conscious, it is available to reasoning, report, and action), and its competitive dynamics (stimuli compete to enter the global workspace). It has strong empirical support from neuroimaging and electrophysiology, where 'ignition' — a sudden, widespread activation of prefrontal and parietal cortex — correlates with the transition from unconscious to conscious processing.

The critical limitation of GWT is that it explains access consciousness — which information is globally available for reasoning and report — while leaving phenomenal consciousness entirely untouched. It tells us why some information can be reported and acted on. It does not tell us why that information feels like anything. As Ned Block's distinction makes clear, a system could have complete global workspace architecture and broadcast information without there being anything it is like to be that system. Global Workspace Theory, in its current form, is a theory of cognitive integration mistaken for a theory of consciousness. The confusion between these two problems — treating 'globally available' as equivalent to 'experienced' — is the field's most persistent conflation.