Brain

1. The Four Main Lobes

  • Frontal Lobe: Controls high-level planning, decisions, and personality. Damage causes impulsivity, bad choices, and personality shifts.

  • Parietal Lobes: Processes touch, temperature, and spatial layout. Damage causes numbness and spatial disorientation.

  • Temporal Lobes: Handles hearing, language, and memory formation. Damage causes hearing loss and memory issues.

  • Occipital Lobes: Decodes all visual input from your eyes. Damage causes blind spots or total blindness.

2. Limbic & Core Structures

  • Hypothalamus: Regulates body temperature, hunger, thirst, and sleep. Damage ruins body temperature control and appetite.

  • Hippocampus: Creates new long-term memories. Damage causes severe inability to form new memories.

  • Amygdala: Triggers emotions like fear and aggression. Damage removes fear or causes hyper-aggression.

  • Cerebellum: Controls balance, posture, and smooth motor movement. Damage causes clumsiness and loss of balance.

  • Thalamus: Relays sensory signals (except smell) to the brain. Damage causes sensory confusion or coma.

  • Reticular Formation: Controls sleep, alertness, and consciousness. Damage causes a permanent coma.

  • Medulla: Controls automatic survival functions like breathing and heart rate. Damage causes immediate death.

3. Cortices & Speech Areas

  • Sensory Cortex: Maps and processes physical touch across the body. Damage causes loss of touch sensation.

  • Motor Cortex: Commands voluntary muscle movements. Damage causes muscle weakness or paralysis.

  • Visual Cortex: Processes visual shapes, colors, and motion. Damage causes visual field loss.

  • Auditory Cortex: Processes sound pitch, volume, and tones. Damage causes difficulty recognizing sounds.

  • Broca’s Area: Controls physical speech production. Damage lets you understand words but prevents speaking them.

  • Wernicke’s Area: Controls language comprehension. Damage causes fluent speech that makes zero sense ("word salad").

4. Reward, Dopamine & Emotion Circuits

  • Nucleus Accumbens: Drives pleasure, motivation, and reward circuits. Damage causes loss of motivation and pleasure.

  • Ventral Tegmental Area (VTA): Produces dopamine for reward pathways. Damage drops dopamine, causing severe depression and apathy.

  • Substantia Nigra: Produces dopamine needed for smooth movement. Damage causes Parkinson's disease tremors and stiffness.

  • Anterior Cingulate Cortex: Manages emotional self-control and error checking. Damage causes emotional apathy and poor impulse control.

  • Prefrontal Cortex: Controls complex logic, personality, and impulse restraint. Damage creates extreme reckless behavior and personality changes.