A. D. Craig

A. D. (Bud) Craig is an American neuroanatomist whose work identified the insular cortex — particularly the anterior insula — as the neural substrate for interoception and the physiological basis of subjective feeling states. Craig mapped the lamina I spinothalamocortical pathway, showing how small-diameter afferent fibers carry information about temperature, pain, metabolic state, and visceral conditions from the body to the insular cortex.

Craig’s 2002 paper “How do you feel?” proposed that interoception — the sense of the body’s internal physiological condition — constitutes the basis for subjective awareness. The anterior insula integrates raw physiological signals into a coherent representation of the body’s current state, which Craig called the “sentient self.” This work reframed interoception from a minor autonomic feedback channel into a foundational sensory system underlying emotion, self-awareness, and decision-making.

Craig’s research has informed clinical approaches to anxiety, dissociation, and trauma, all of which involve disruptions in interoceptive processing. The three-dimensional model of interoception — accuracy, sensibility, and awareness — that subsequent researchers developed builds on Craig’s anatomical and functional mapping.

Notable works

• “How do you feel? Interoception: the sense of the physiological condition of the body” (2002)
• “How do you feel — now? The anterior insula and human awareness” (2009)

Related

• interoception — the sensory system Craig’s work defined
• Stephen Porges — neuroscientist whose polyvagal theory complements Craig’s interoceptive model