Neurology Exam Prep Podcast Episode 69 - Disorders of Cortical Visual Processing
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Jul 1, 2024 Experts Kevin Yan, Vanessa Veloso, and Jeremy Moeller discuss disorders of cortical visual processing, including cortical blindness, prosopagnosia, and visual hallucinations. They explore the intricate visual pathways in the brain, historical background of related syndromes, and the disconnect between areas responsible for visual perception and language comprehension.
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Two Main Visual Brain Streams
- Visual information follows two main brain streams: the dorsal "where" pathway and the ventral "what" pathway.
- The dorsal stream processes spatial location; the ventral stream processes object identity and language in the dominant hemisphere.
Anton’s Syndrome Unawareness
- Anton's syndrome features cortical blindness paired with anosognosia, meaning patients are unaware they are blind.
- They often confabulate visual experiences, truly believing they can see despite total occipital cortex damage.
Color Vision Processing Localized
- Central hemichromatopsia is a rare syndrome causing color blindness on one half of the visual field with preserved acuity.
- This reflects lesions in an area specialized for color perception located just inferior to the primary visual cortex along the ventral stream.