lizard brain

From Wiktionary, the free dictionary
Jump to navigation Jump to search



lizard brain (plural lizard brains)

  1. (anatomy, psychology) The most primitive part of the brain; the brain stem.
  2. (by extension) Any part of a person's psyche or personality dominated by instinct or impulse rather than rational thought.
    Synonyms: id, reptilian brain
    • 2017 November, N. K. Jemisin, Mac Walters, chapter 8, in Mass Effect Andromeda: Initiation[1], 1st edition (Science Fiction), Titan Books, →ISBN, →OCLC, page 155:
      With her pistol drawn, she hurried down the ramp and into cover behind one of the landing pad’s walls, listening carefully. The hangar was as silent as—well, as a tomb. The temptation to take off her helmet was powerful, to rely on scents and sounds and instincts instead of equipment and sensors. Everything about this mess had her lizard-brain in overdrive. SAM-E’s warning about a hostile intent in the system, controlling life support and even the hangar bay doors, kept her from obeying that instinct.

Related terms[edit]