Interoceptive Dimensions

Interoception is not a single ability — it has three distinct dimensions that can develop independently and interact in clinically important ways. (Lesson 6)

The Three Dimensions

Interoceptive Accuracy (IA) The objective ability to correctly detect body signals. Measured by tasks like heartbeat counting (reporting how many beats occurred in a time window without touching the pulse).

Trainable through consistent practice (body-scan, yoga-as-training)
Provides the raw signal fidelity from which granularity is built
High IA = signals arrive at the brain with specificity and differentiation

Interoceptive Sensibility (IS) The subjective belief in how sensitive or attuned you are — how much "space" you give internal body experience in your mental life.

This is not correlated with Accuracy — someone can have high IS and low IA (they believe they're very body-aware but aren't accurate)
IS is a disposition toward attending to internal states

Metacognitive Interoceptive Awareness The ability to judge when your felt sense is actually reliable versus when it's a prediction artifact, an outdated model, or noise. The "Internal Auditor" function.

The most sophisticated dimension
Requires both IA (to have something accurate to assess) and IS (to attend to it)
Allows the question: "Is what I'm sensing now a real signal or a prediction error?"

The Anxiety Gap

The most clinically significant interaction: high Sensibility + low Accuracy

The person attends heavily to internal states (high IS) but the signals they receive are imprecise and undifferentiated (low IA). The result: a great deal of vague, high-volume internal noise that the brain cannot parse into specific, meaningful signals.

Because the brain prefers any explanation over uncertainty (per the predictive processing framework), it tends to resolve ambiguous noise by defaulting to global threat labeling: "Something is wrong." This is the mechanism of anxiety — not false signals, but signals of insufficient precision that get catastrophized. (Lesson 6)

Resolution: training Accuracy closes the gap. With higher-precision signals, even intense sensations can be deconstructed into specific components (location, quality, intensity, change over time) rather than experienced as undifferentiated threat. This is interoceptive granularity.

The Hypo-arousal Flip: Emotional Blunting

The Anxiety Gap's mirror image: low Sensibility + low Accuracy. The person neither attends to nor accurately reads internal states. The result is not overactivation but underconnection — a muted or absent felt sense of being alive.

Low interoceptive awareness correlates with hypo-arousal, dissociation, and emotional blunting. If the brain can't receive sufficient interoceptive data, it can't construct the "felt sense" of engagement, connection, or aliveness — leaving a chronically narrowed window biased toward shutdown rather than panic. (Card: "Interoception Widens the Window")

The clinical distinction matters: high-IS/low-IA practitioners (Anxiety Gap) typically benefit most from training Accuracy through precise body-scan work. Low-IS/low-IA practitioners often need to rebuild the Sensibility disposition first — redirecting attention toward internal experience before refining precision.

Granularity

Granularity is the ability to distinguish subtle shades of internal states — the resolution of the body's internal map. It is the practical output of high Accuracy development.

At high granularity:

Shame can be deconstructed: "chest heat, jaw tension, slight nausea, increased breathing rate" — manageable data points rather than an overwhelming monster
The "Internal Auditor" becomes possible: comparing multiple simultaneous signals to identify prediction errors vs. genuine current states
Emotional regulation becomes proactive rather than reactive — the rumble strip before the cliff

This is the bridge between interoception and the theory-of-constructed-emotion: because emotions are constructed from physiological raw material (affect), higher-resolution affect data produces more differentiated, proportionate emotional constructions. (Lesson 7)

Sources

Lesson 6 — Interoception and the Insular Cortex
Lesson 7 — Interoceptive Training
Card: "Interoception Widens the Window"