Type: Catecholamine
Receptors: α and β adrenergic receptors
Region-specific functions:

• Locus coeruleus (origin): Projects broadly

• Prefrontal cortex: Enhances attention, working memory (via α2A receptors)

• Amygdala: Modulates fear, emotional memory

• Thalamus: Increases sensory signal-to-noise ratio

• Hippocampus: Stress-modulated memory encoding

• Low levels → inattention (ADHD); high levels → anxiety, hyperarousal