Global workspace dynamics: cortical "binding and propagation" enables conscious contents

Area of Science:

• Neuroscience
• Cognitive Science
• Computational Theory

Background:

• Conscious experiences are thought to involve a global workspace (GW) facilitating information binding and propagation.
• The cortico-thalamic (C-T) core in humans is implicated in conscious perception, memory, and executive functions.
• Understanding the neural basis of consciousness requires differentiating conscious from unconscious brain events.

Purpose of the Study:

• To present Global Workspace (GW) theory as a functional model for understanding conscious brain events.
• To explore how the cortico-thalamic (C-T) core dynamically binds and propagates neural signals for conscious awareness.
• To explain the unitary nature of conscious percepts and the capacity for a vast range of conscious contents over time.

Main Methods:

• Theoretical modeling of brain function based on GW principles.
• Analysis of the cortico-thalamic (C-T) core's role in binding and broadcasting neural signals.
• Exploration of neural mechanisms like phase coupling and adaptive resonance for information integration.

Main Results:

• Conscious capacity is proposed as a dynamic functional hub, not a single anatomical location.
• Conscious contents arise from winner-take-all equilibria in the C-T core, broadcasting via synchronized neural activity (e.g., theta/gamma coupling).
• The theory accounts for the limited capacity of conscious moments (1-4 items) and the binding of specialized neural maps.

Conclusions:

• Global Workspace theory offers a framework for understanding consciousness as a dynamic, distributed neural process.
• The cortico-thalamic core acts as a functional hub, integrating information through synchronized neural oscillations.
• The hippocampal complex may also contribute to conscious event organization and memory storage within this GW architecture.