The Mind's Theater: History, Conceptual Evolution, and Neuroscientific Correlates of Charles Bonnet Syndrome

Abstract

Charles Bonnet syndrome (CBS) represents a profound and paradoxical neurological condition, a crossroads between ophthalmology, neurology, and the philosophy of mind, in which vivid, complex, and often spectacular visual hallucinations occur in neurologically and psychiatrically healthy individuals, in response to significant vision loss. This narrative-style scientific chapter aims to explore CBS in its entirety, tracing a path from its first, illuminating description in the Age of Enlightenment to the most refined contemporary neuroscientific theories that interpret it as a privileged window into the mechanisms of conscious perception. Through an extensive analysis of the literature, the clinical panorama of the syndrome will be detailed, with an in-depth taxonomy of its hallucinatory manifestations. Particular emphasis will be placed on the etiology of visual deafferentation, examined not as a simple passive event but as a dynamic process of cerebral reorganization. The neural correlates will be investigated through the lenses of neuroimaging, neurophysiology, and Bayesian computational models, with a critical examination of dominant theories, from the classic “Release Theory” to the modern “Perceptual Hypothesis Model.” Ample space will be dedicated to recent neuroscientific literature, which links the hyperactivity of associative visual networks to cross-modal plasticity and the functional architecture of intrinsic neural networks, such as the default mode network. The chapter concludes by reflecting on the human impact of CBS and its fundamental role in challenging dogmas about the nature of perceived reality, suggesting that this condition is not a mere pathological epiphenomenon but a revelation about the constructive and active nature of every perceptual act.