The Blind Contour of Imagination: Why You Don't Need a "Picture in Your Head" to Control Your Body

For a long time, popular psychology and self-regulation practices were dominated by one rigid stereotype: if you want your body to respond to something, you must visualize it in detail. Want to relax - picture a seashore in HD quality. Want to relieve a vascular spasm - mentally draw how your capillaries expand.

But the neurobiology of predictive coding and the study of one interesting phenomenon completely destroyed this myth. It turned out that the brain does not need a visual render at all to reprogram the autonomic system.

Lessons of Aphantasia: Meaning is More Important Than Pixels

There is a neurocognitive trait called aphantasia - a person's inability to voluntarily create visual images in their "mind's eye". Closing their eyes, a person with aphantasia sees only darkness. No mental apples, no landscapes.

For a long time, it was believed that such people lacked imagination. But clinical tests have shown an amazing thing: the bodies of people with aphantasia react absolutely normally to imagined scenarios (Silvanto, 2026). If they "imagine" a lemon, they salivate. If they "think" about a scary situation, their heart rate increases.

Studying this paradox led to a fundamental conclusion: the autonomic nervous system (the insula) does not need visual pixels, it needs a concept (Bartolomeo, 2026). The visual cortex of the occipital lobe is simply a monitor that renders the picture. Activation of the visual cortex during imagination is merely rudimentary sensory precursors. The actual knowledge of what is happening (semantics, probability weight, context) is formed in the higher associative zones. To trigger vasodilation or lower cortisol levels, a semantic command is sufficient for the brain. The forced attempt to "see" this process only interferes.

The Error of Cognitive Overstrain

When a person tries to visualize something that is not there by willpower (for example, cellular regeneration or muscle relaxation), they exert a cognitive effort (Abdelrahman, Melcher, & Ripollés, 2025).

• This effort activates the sympathetic nervous system (fight/flight mode).
• The prefrontal cortex generates beta waves.
• A "prediction error" occurs: the brain realizes that you are currently trying to invent something that does not exist in reality (Silvanto & Nagai, 2025).

Within the framework of Bayesian predictive coding, attempts to generate high-precision top-down visual predictions require immense cognitive amplification. Objective measurements show that in people with intact vision, such amplification changes autonomic tone and increases heart rate due to the physiological strain of "rendering". Instead of the expected molecular silence and relaxation, you get micro-stress and vascular spasm because you are "trying" too hard.

Abdelrahman, N., Melcher, D., & Ripollés, P. (2025). Seeing is feeling: How aphantasia alters emotional engagement with stories. Psychophysiology. Advance online publication. DOI: 10.1111/psyp.70100

Bartolomeo, P. (2026). An integration model of mental imagery and aphantasia: Conceptual framework, neuromechanistic pathways, and clinical implications. Neuropsychologia, 225, 109401. DOI: 10.1016/j.neuropsychologia.2026.109401

Silvanto, J. (2026). The interoceptive origins of mental imagery: An evolutionary account. Frontiers in Psychology, 17, 1807114. DOI: 10.3389/fpsyg.2026.1807114

Silvanto, J., & Nagai, Y. (2025). Interoception, insula, and agency: A predictive coding account of aphantasia. Frontiers in Psychology, 16, 1564251. DOI: 10.3389/fpsyg.2025.1564251