Article: article from journal or magazin.
The neural structures expressing perceptual hysteresis in visual letter recognition.
Publication types: Journal Article ; Research Support, Non-U.S. Gov'tPublication Status: ppublish
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.
Adult, Attention/physiology, Brain Mapping, Cerebral Cortex/anatomy & histology, Cerebral Cortex/physiology, Cognition/physiology, Contrast Sensitivity/physiology, Female, Functional Laterality/physiology, Humans, Illusions/physiology, Magnetic Resonance Imaging, Male, Neural Pathways/anatomy & histology, Neural Pathways/physiology, Pattern Recognition, Visual/physiology, Photic Stimulation, Psychomotor Performance/physiology, Reading, Sensory Deprivation/physiology, Verbal Behavior/physiology
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