The neural structures expressing perceptual hysteresis in visual letter recognition
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Updated: Sep 30, 2026

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
Published on: May 12, 2019
Andreas Kleinschmidt1, Christian Büchel, Chloe Hutton
1Department of Neurology, Johann Wolfgang Goethe University, Theodor-Stern-Kai 7, D-60590 Frankfurt/M, Germany. akleins@em.uni-frankfurt.de
Abstract:
Perception can change nonlinearly with stimulus contrast, and perceptual threshold may depend on the direction of contrast change. Such hysteresis effects in neurometric functions provide a signature of perceptual awareness. We recorded brain activity with functional neuroimaging in observers exposed to gradual contrast changes of initially hidden visual stimuli. Lateral occipital, frontal, and parietal regions all displayed both transient activations and hysteresis that correlated with change and maintenance of a percept, respectively. Medial temporal activity did not follow perception but increased during hysteresis and showed transient deactivations during perceptual transitions. These findings identify a set of brain regions sensitive to visual awareness and suggest that medial temporal structures may provide backward signals that account for neural and, thereby, perceptual hysteresis.
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