Plato's cave and the neurobiology of reality construction.
Neuroscience July 3, 2026 Alexis Demas
Contemporary neuroscience and psychology increasingly view perception as an active inferential process, where sensory experience arises from internally generated hypotheses shaped by prediction and uncertainty. Plato's allegory of the cave, which suggests humans mistake mediated appearances for reality, offers an early intuition of this idea. This Perspective argues that medicine, especially neurology and psychiatry, benefits from an explicit understanding of how the brain constructs subjective reality. Symptoms like hallucinations can be reframed as alterations in reality construction rather than isolated perceptual errors, complementing existing diagnostic frameworks. The paper proposes that clarifying how reality is built can enrich clinical reasoning, improve dialogue with patients, and guide research linking subcortical gating, cortical priors, and symptom phenomenology.