Interoception

What Does Interoception Actually Sense?

The conventional view restricted interoception to visceral sensation — gut feelings, cardiac awareness. Craig’s foundational redefinition expanded the term to encompass the physiological condition of the entire body, carried by small-diameter afferent fibers through the lamina I spinothalamocortical pathway (Craig, 2002). This system conveys temperature, pain, itch, sensual touch, muscular effort, and visceral states to a cortical representation in the posterior and anterior insula. Craig identifies the anterior insula of the right hemisphere as the site where these signals are re-represented into subjective feeling — the neural basis of knowing how you feel.

“This anatomical organization shows that these feelings are highly resolved, sensory aspects of ongoing homeostasis that represent the physiological condition of the body itself.” — A.D. Craig, How Do You Feel? Interoception (2002)

In plain terms: the brain builds a real-time image of the body’s internal landscape, and that image is what we experience as feeling.

Barrett extends this architecture through a predictive framework (Barrett, 2017). The brain does not passively receive body signals — it predicts them. Body-budgeting regions issue interoceptive predictions about metabolic need, and the posterior insula computes prediction error against incoming sensory data. What we experience as affect, pleasant or unpleasant, calm or aroused, is the brain’s best guess about the state of its body budget.

Why Does Interoceptive Dysfunction Matter Clinically?

Khalsa and colleagues identify interoceptive disruption as a transdiagnostic feature across mood disorders, anxiety, eating disorders, addiction, PTSD, and somatic symptom disorders (Khalsa et al., 2018). The mechanism differs by condition — hypervigilant interoceptive prediction in anxiety, blunted interoceptive access in dissociation and addiction — but the common denominator is a breakdown in the body-to-brain signaling loop that organizes emotion regulation. Price and Hooven frame this directly: interoceptive awareness is the window to emotional experience and a primary mechanism of emotion regulation (Price & Hooven, 2018). When that window closes, through trauma, chronic stress, or developmental disruption, the capacity to identify, tolerate, and modulate feeling collapses.

How Does Depth Psychology Converge with Interoceptive Science?

Long before insular cortex mapping, depth psychology insisted the body was the ground of psychic life. Jung’s assertion that the psyche’s deeper layers “retreat into darkness” and become “extinguished in the body’s materiality” (Jung, 1951) describes the same territory Craig maps neuroanatomically. Heller’s concept of the felt sense — emerging at the intersection of bodily sensation, emotional response, and cognitive attention — operationalizes what interoceptive neuroscience now measures as the integration of afferent signals into conscious awareness (Heller, 2012). The convergence is structural, not metaphorical: both traditions locate selfhood in the body’s capacity to feel itself.

Sources Cited

• Craig, A.D. (2002). How Do You Feel? Interoception: The Sense of the Physiological Condition of the Body. Nature Reviews Neuroscience, 3(8), 655–666.
• Barrett, Lisa Feldman (2017). How Emotions Are Made: The Secret Life of the Brain. Houghton Mifflin Harcourt.
• Khalsa, Sahib S. et al. (2018). Interoception and Mental Health: A Roadmap. Biological Psychiatry: Cognitive Neuroscience and Neuroimaging, 3(6), 501–513. DOI: 10.1016/j.bpsc.2017.12.004.
• Price, Cynthia J. & Hooven, Carole (2018). Interoceptive Awareness Skills for Emotion Regulation. Frontiers in Psychology, 9, 798.
• Heller, Laurence (2012). Healing Developmental Trauma. North Atlantic Books.
• Jung, Carl Gustav (1951). Aion: Researches into the Phenomenology of the Self. CW 9ii. Princeton University Press.