The reframed Triune metaphor uses Blue, Red, and Gray Brain to help us understand changing brain-body states under stress. These are not separate brains, but dynamically interacting neural systems in which different systems can become more dominant.
Paul MacLean’s original Triune Brain hypothesis described three evolutionary brain systems associated with survival, emotion and social behaviour, and higher cognitive functions. Modern neuroscience no longer views these as three distinct “brains.” Instead, we understand the brain as a deeply interconnected network, with self-regulating systems distributed across the neuroaxis, from the brainstem and midbrain through the diencephalon and limbic system to the neocortex. Shanker Self-Reg reframes MacLean’s three brains as three dynamic neural states: Blue Brain (prefrontal dominance), Red Brain (limbic dominance), and Gray Brain (survival mechanisms dominate). All of these systems continue to interact, but their relative dominance changes with brain-body state. Under excessive stress, Gray Brain survival systems may activate, Red Brain processes may become hyperaroused, and Blue Brain functions may be blunted.
Blue, Red, and Gray Brain are not separate brains. They are a metaphor for dynamically changing neural states that shape how we think, feel, act, connect, and respond to stress.
