This contribution draws inspiration from the ‘loss of reason,’ a divergent fury that finds recuperation in representation, here understood as the mind’s capacity to modify the rules of ordinary perception. It takes as its object of inquiry visual hallucination, considered in its nature as a morphologically structured phenomenon. The analysis of visions arising in altered states of consciousness –whether induced by external substances or by internal cognitive conditions– makes it possible to delineate an organized repertoire of hallucinatory images according to criteria grounded in geometric matrices and varying degrees of complexity. Such a repertoire can be explored in its quality as visual matter, with primary reference to the scientific and historical literature, and in particular to the studies on the hallucinatory effects of mescaline conducted by Heinrich Klüver, who identifies the recurrence of specific “form-constants,” and by Oliver Sacks, who describes a wide variety of hallucinatory phenomena in relation to different mental conditions. The interpretive process of hallucination also assumes a determining value, insofar as environmental and cultural conditioning intervene to orient the attribution of meaning to visual manifestations. Through an approach that combines neuroscience and visual culture, this contribution interprets drawing and representation as privileged tools for the semantic articulation of hallucinatory experience, within a process of recovery of meaning that takes the (mis)perceived form and transforms it into a signifying mark.

Questo contributo trae ispirazione dalla “perdita del senno”, furia divergente che trova recupero nella rappresentazione, che qui viene intesa come capacità della mente di modificare le regole della percezione ordinaria, e assume come oggetto di indagine l’allucinazione visiva, considerandola nella sua natura di fenomeno morfologicamente strutturato. L’analisi delle visioni che insorgono negli stati alterati di coscienza, siano essi indotti da sostanze esterne o da condizioni cognitive interne, consente di delineare un repertorio organizzato delle immagini allucinatorie, secondo criteri di matrice geometrica e di complessità variabile. Tale repertorio può essere esplorato nella sua qualità di materia visiva, assumendo come principale riferimento la letteratura scientifica e storica, e in particolare gli studi sugli effetti allucinatori della mescalina svolti da Heinrich Klüver, che individua la ricorrenza di specifiche “costanti di forma”, e da Oliver Sacks, che descrive un’ampia varietà di fenomeni allucinatori relazionandoli a differenti condizioni mentali. Anche il processo interpretativo dell’allucinazione assume un valore determinante, perché in esso intervengono condizionamenti ambientali e culturali capaci di orientare l’attribuzione di significato alle manifestazioni visive. Attraverso un approccio che coniuga neuroscienze e cultura visuale, il contributo interpreta il disegno e la rappresentazione come strumenti privilegiati per la semantizzazione dell’esperienza allucinatoria, secondo un percorso di recupero di senso che assume la forma (dis)percepita e la trasforma in segno significante.

“Fingendo la sua imago”. L’allucinazione nella cultura visuale

Menchetelli Valeria
2026

Abstract

This contribution draws inspiration from the ‘loss of reason,’ a divergent fury that finds recuperation in representation, here understood as the mind’s capacity to modify the rules of ordinary perception. It takes as its object of inquiry visual hallucination, considered in its nature as a morphologically structured phenomenon. The analysis of visions arising in altered states of consciousness –whether induced by external substances or by internal cognitive conditions– makes it possible to delineate an organized repertoire of hallucinatory images according to criteria grounded in geometric matrices and varying degrees of complexity. Such a repertoire can be explored in its quality as visual matter, with primary reference to the scientific and historical literature, and in particular to the studies on the hallucinatory effects of mescaline conducted by Heinrich Klüver, who identifies the recurrence of specific “form-constants,” and by Oliver Sacks, who describes a wide variety of hallucinatory phenomena in relation to different mental conditions. The interpretive process of hallucination also assumes a determining value, insofar as environmental and cultural conditioning intervene to orient the attribution of meaning to visual manifestations. Through an approach that combines neuroscience and visual culture, this contribution interprets drawing and representation as privileged tools for the semantic articulation of hallucinatory experience, within a process of recovery of meaning that takes the (mis)perceived form and transforms it into a signifying mark.
2026
9791282811040
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/1630314
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