Related Experiment Video
Updated: Aug 13, 2026

07:11
Functional Magnetic Resonance Imaging (fMRI) of the Visual Cortex with Wide-View Retinotopic Stimulation
Published on: December 8, 2023
Sympathomimetic-induced kaleidoscopic visual illusion associated with a reversible splenium lesion
Heather Winslow1, Bruce Mickey, Elliot M Frohman
1Department of Neurology, University of Texas Southwestern Medical Center, Dallas, TX 75235, USA.
Archives of Neurology
|January 13, 2006
Summary
Sympathomimetic diet pills caused temporary brain lesions and visual disturbances in an adolescent. Stopping the medication resolved these symptoms and reversed the brain changes, suggesting a reversible metabolic derangement.
Area of Science:
- Neurology
- Radiology
- Pharmacology
Background:
- Central nervous system metabolic derangements from sympathomimetics can cause reversible neurological and radiographic changes.
- Transient lesions in the corpus callosum splenium have been observed in association with these derangements.
Observation:
- A 17-year-old female experienced kaleidoscopic visual illusions while using diet pills containing sympathomimetics.
- Magnetic resonance imaging revealed a transient lesion in the splenium of her corpus callosum.
Findings:
- Withdrawal from sympathomimetic diet pills led to the cessation of visual episodes.
- Magnetic resonance imaging confirmed the normalization of the corpus callosum lesion after medication cessation.
Implications:
- Sympathomimetic use can induce reversible brain lesions and neurological symptoms, such as visual disturbances.
- The case suggests a potential link between sympathomimetic-induced metabolic changes, transient corpus callosum lesions, and visual phenomena, possibly related to migraine triggers.
Related Concept Videos
Synesthesia
Synesthesia is a remarkable condition where stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway. People with synesthesia experience a blending or crossing of their senses, such as sight and sound, leading to cross-modal sensations. In this condition, the stimulation of one sense, such as hearing a number or musical note, triggers an experience of another sense, like sensing a specific color, taste, or smell. People...
Visual Agnosia
Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...