Interoception

The sense of the body's internal state - heartbeat, breath, core temperature, gut signals, muscle tension. Maps to the insular cortex. Some neuroscientists call it the sense most people never learned.

Mapped along three measurable dimensions: accuracy (can you actually detect signals), sensibility (do you think you can), and insight (does your perception match what is actually happening). Most people score high on sensibility and low on accuracy.

Temperature contrast trains accuracy through brute signal strength. The cold won't let you feel cold and call it something else.