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Updated: Sep 10, 2025

Induction of an Isoelectric Brain State to Investigate the Impact of Endogenous Synaptic Activity on Neuronal Excitability In Vivo
Published on: March 31, 2016
The Criticality of Consciousness: Excitatory-Inhibitory Balance and Dual Memory Systems in Active Inference.
Don M Tucker1,2, Phan Luu1,2, Karl J Friston3,4
1Brain Electrophysiology Laboratory Company, 440 E. Broadway, Suite 200, Eugene, OR 97401, USA.
Consciousness relies on two distinct limbic memory systems, one excitatory and one inhibitory. Balancing these systems, termed E-I criticality, is crucial for optimal cognitive function and psychological health.
Area of Science:
- Neuroscience
- Cognitive Science
- Psychology
Background:
- Consciousness is theorized through complex models.
- Working memory capacity, vital for cortical consciousness, is supported by dual limbic memory systems.
Purpose of the Study:
- To review evidence supporting dual limbic systems for working memory.
- To propose a model where these systems alternate in sleep and balance during wakefulness for consciousness.
Main Methods:
- Review of empirical evidence on dorsal (Papez) and ventral (Yakovlev) limbic networks.
- Analysis of neurophysiological regulation (feedforward vs. feedback control) and sleep consolidation (REM vs. NREM).
Main Results:
- Dorsal limbic system: excitatory, feedforward, REM-consolidated, phasic arousal-driven.
- Ventral limbic system: inhibitory, feedback, NREM-consolidated, tonic activation-driven.
- Waking consciousness requires a balance (criticality) between these dual systems for optimal active inference.
Conclusions:
- Dual limbic systems with distinct affective properties (elation vs. anxiety) regulate sleep and consciousness.
- E-I criticality optimizes self-regulation, psychological health, and subjective experience.
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