lizard brain
Ancient survival circuitry
The lizard brain is the primitive, instinct-driven part of the mind—the brainstem and limbic system that governs survival responses like fear, aggression, and desire.
In popular psychology, it explains impulsive or irrational behavior: My lizard brain wanted to punch him.
The term suggests ancient wiring that overrides higher reasoning.
Instinctive sense about something
- impulseSudden urge to act
- intuitionInstinctive immediate understanding
- reflexInvoluntary stimulus response
- automaticOperating without intervention
visceral · hardwired · innate · primal urge · unthinking · spontaneous · subconscious · hunch
Emotion-processing brain cluster
- brainstemLower neural trunk
- basal gangliaSubcortical motor-control nuclei
- limbic systemEmotional brain structures
- hypothalamusSubthalamic regulatory brain region
autonomic · cortisol · adrenaline · neural · evolutionary · hindbrain · neurological
Physical or verbal conflict
- flightAerial journey by aircraft
- freezeBecome solid from cold
- predatorOrganism that consumes others
- preyAnimal being hunted
threat detection · territorial · self-defense · aggression · dominance · hoarding · scarcity mindset · hyperawareness
Uncontrollable sudden fear
- alarmUrgent warning signal
- terrorExtreme, overwhelming fear
- dreadIntense anticipatory fear
- anxietyPersistent apprehensive distress
startle · fright · hypervigilance · paranoia · phobia · danger · foreboding · fight-or-flight
gut feeling
Instinctive sense about something
- impulseSudden urge to act
- intuitionInstinctive immediate understanding
- reflexInvoluntary stimulus response
automatic · visceral · hardwired · innate · primal urge · unthinking · spontaneous · subconscious · hunch · snap judgment
amygdala
Emotion-processing brain cluster
- brainstemLower neural trunk
- basal gangliaSubcortical motor-control nuclei
- limbic systemEmotional brain structures
hypothalamus · autonomic · cortisol · adrenaline · neural · evolutionary · hindbrain · neurological
fight
Physical or verbal conflict
prey · threat detection · territorial · self-defense · aggression · dominance · hoarding · scarcity mindset · hyperawareness · vigilance
panic
Uncontrollable sudden fear
anxiety · startle · fright · hypervigilance · paranoia · phobia · danger · foreboding · fight-or-flight · freeze response
- lizard brainbrainstem, fight or flight, survival instincts, fear response, instinctive behavior
- brain termsdopamine, serotonin, amygdala, neurons, synapses
lizard brainrational mind
higher reasoning · neocortex · prefrontal cortex · executive function · conscious mind
lizard brainmeasured response
Controlled, proportional reply
impulse control · equanimity · cool head · level-headedness · composure