Patient PL518 reported an almost complete absence of visual imagery following a stroke. This was in stark contrast to his (in his own opinion) above average ability for visual imagery before his stroke that he had relied upon in his work as an architect.
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PL518's performance across a range of perceptual and cognitive tests was similar to those of four other stroke patients (including another architect) with the exception that PL518 reported severe visual imagery problems.
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Lesion profiles were also comparable with the exception that PL518 showed selective damage in the right lingual gyrus and left medial posterior fusiform gyrus. These regions were only affected in PL518 compared to patients with similar cognitive and perceptual deficits.
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While several brain regions in both hemispheres are involved in different aspects of mental imagery, our results indicate that the right lingual gyrus and especially the left posterior medial fusiform gyrus are candidate regions for specific involvement in *visual* imagery.
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PL518 reported that his abilities for visual mental imagery had been above average before his stroke. These abilities had enabled him to visualize the spatial and visual attributes of buildings and rooms in rich details and contributed greatly to his achievements as an architect.
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This fits a pattern noted by Farah where many cases of acquired deficits in visual imagery involved people whose activities had likely demanded visualization. Individual differences in premorbid ability for imagery might play a role in the effects of stroke on these abilities.
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Tagging Randi Starrfelt here, didn't know she was on Twitter!
@randistarPrikaži ovu nitHvala. Twitter će to iskoristiti za poboljšanje vaše vremenske crte. PoništiPoništi
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Just to add I have
#aphantasia but can still#imagine it’s just not visually based for me
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You raise a valid and valuable point. Words are powerful and we will be more careful in our choice of words in our future work on
#aphantasia - Još 2 druga odgovora
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Students in
#K12 schools last week were fascinated by this topic (& more)!
#scicomm#outreach


https://nwnoggin.org/2020/01/20/north-coast-noggins-art-alevins-brains/ …pic.twitter.com/bRkm1UplED
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