Insular Cortex: The Brain's Interoception Center

The insular cortex (insula) lies deep within the lateral sulcus, separating the frontal/parietal lobes from the temporal lobe. It is the primary cortical region for interoception—the sense of the body's internal state.

Key functions:

• Visceral sensation: bladder fullness, lung stretch (breath-holding urge), heartbeat awareness, gastric distension
• Emotional processing: integrates bodily signals with feelings (e.g., disgust, empathy, anxiety)
• Decision-making: weighs internal states against external options
• Autonomic regulation: influences heart rate, blood pressure, digestion via connections to hypothalamus and brainstem

Dysfunction is implicated in anxiety disorders, addiction, eating disorders, alexithymia, and chronic pain syndromes.