The neurophysics of consciousness

Area of Science:

• Neuroscience
• Cognitive Science
• Information Theory

Background:

• Consciousness integrates present sensory information with past experiences.
• Brain processes information through local specialization and global interactions.
• Neuronal synchronization and coherence quantify information representation, deviating from random fluctuations.

Purpose of the Study:

• To propose a theory of consciousness based on information integration and brain dynamics.
• To investigate the role of neuronal synchronization and coherence in consciousness.
• To explore the electrophysiological changes associated with anesthesia and consciousness levels.

Main Methods:

• Analysis of neuronal synchronization and coherence in brain activity.
• Quantitative description of normative distributions for synchrony, coherence, and frame durations.
• Assessment of reversible electrophysiological changes during anesthesia.

Main Results:

• Deviations from a 'ground state' of neuronal synchrony and coherence predict consciousness levels during anesthesia.
• Invariant electrophysiological changes occur with loss and return of consciousness, irrespective of anesthetic agent.
• Local field potentials reflect local neuronal synchronization; oscillations facilitate large-scale integration ('binding').

Conclusions:

• Consciousness arises from the integration of local and global brain processes.
• Neuronal synchrony and coherence are key markers of conscious states.
• Anesthesia provides a model for studying the neural correlates of consciousness through reversible changes in brain dynamics.