reptilian brain
Ancient survival center
The reptilian brain is the oldest, most primitive part of the brain—the brainstem and cerebellum—thought to govern basic survival functions like breathing, heart rate, and fight-or-flight responses.
In popular psychology, it refers to instinctive, unthinking reactions: His reptilian brain took over and he lashed out.
The term suggests behavior driven by primal urges rather than reason.
Acute threat reaction
- reflexesAutomatic physical responses
- territorialityDefense of claimed space
- aggressionHostile or attacking behavior
- dominanceSuperior influence over others
submission · hoarding · ritualistic behavior · startle response · prey drive · courtship displays · nesting · hardwired
Lower neural trunk
- amygdalaEmotion-processing brain cluster
- limbic systemEmotional brain structures
- basal gangliaSubcortical motor-control nuclei
- hypothalamusSubthalamic regulatory brain region
medulla · pons · cerebellum · thalamus · hindbrain · midbrain · striatum · neural pathways
Instinct to survive danger
- threat detectionIdentifying possible dangers
- alertnessActive mental awareness
- vigilanceState of keen awareness
- fear responseReaction to perceived danger
escape · defense · attack · feeding · hunger · thirst · homeostasis · safety
Intense, violent anger
- angerIntense hostile emotion
- hostilityAntagonistic disposition toward others
- violenceHarmful physical force
- dominance displayShow of superior status
combat · intimidation · predatory behavior · attack mode · berserker · blind rage · road rage · hair-trigger
First in origin
- ancientVery old indeed
- evolutionaryPertaining to gradual biological change
- prehistoricBefore documented civilization
- ancestralOf one's forebears
atavistic · primordial · vestigial · base instincts · crude · unsophisticated · fundamental · raw
Not awake or aware
- automaticOperating without intervention
- subliminalBelow threshold of awareness
- implicitUnderstood without being stated
- gut feelingInstinctive sense about something
intuitive · involuntary · unthinking · id · shadow self · knee-jerk · autopilot · nonrational
fight-or-flight
Acute threat reaction
- reflexesAutomatic physical responses
- territorialityDefense of claimed space
- aggressionHostile or attacking behavior
dominance · submission · hoarding · ritualistic behavior · startle response · prey drive · courtship displays · nesting · hardwired · unlearned
brainstem
Lower neural trunk
- amygdalaEmotion-processing brain cluster
- limbic systemEmotional brain structures
- basal gangliaSubcortical motor-control nuclei
hypothalamus · medulla · pons · cerebellum · thalamus · hindbrain · midbrain · striatum · neural pathways
self-preservation
Instinct to survive danger
- threat detectionIdentifying possible dangers
- alertnessActive mental awareness
- vigilanceState of keen awareness
fear response · escape · defense · attack · feeding · hunger · thirst · homeostasis · safety · hypervigilance
rage
Intense, violent anger
- angerIntense hostile emotion
- hostilityAntagonistic disposition toward others
- violenceHarmful physical force
dominance display · combat · intimidation · predatory behavior · attack mode · berserker · blind rage · road rage · hair-trigger · alpha behavior
primal
First in origin
- ancientVery old indeed
- evolutionaryPertaining to gradual biological change
- prehistoricBefore documented civilization
ancestral · atavistic · primordial · vestigial · base instincts · crude · unsophisticated · fundamental · raw · elemental
unconscious
Not awake or aware
- automaticOperating without intervention
- subliminalBelow threshold of awareness
- implicitUnderstood without being stated
gut feeling · intuitive · involuntary · unthinking · id · shadow self · knee-jerk · autopilot · nonrational · prerational
- brain regionscerebrum, frontal lobe, temporal lobe, parietal lobe, occipital lobe
- mythsmyth, legend, fable, fairy tale, folk tale
- instinctsinstinct, survival instinct, survival instincts, maternal instinct, gut instinct
reptilian brainneocortex
Higher cognition brain region
prefrontal cortex · cerebral cortex · frontal lobe · limbic system
reptilian brainrational mind
higher reasoning · analytical thinking · reflective thinking · executive function · logical thinking
reptilian brainhigher self
One's transcendent inner nature
impulse control · self-regulation · conscious choice · moral conscience · willpower
reptile, reptilian, reptiles, brain, brains, brainy, brainless, brainstorm, brainpower