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• W4385807598 abstract "Abstract Aphantasia prohibits people from experiencing visual imagery. While most of us can readily recall decade-old personal experiences (autobiographical memories, AM) with vivid mental images, there is a dearth of information about whether the loss of visual imagery in aphantasics affects their AM retrieval. The hippocampus is thought to be a crucial hub in a brain-wide network underlying AM. One important question is whether this network, especially the connectivity of the hippocampus, is altered in aphantasia. In the current study, we tested 14 congenital aphantasics and 16 demographically matched controls in an AM fMRI task to investigate how key brain regions (i.e., vmPFC, hippocampus and visual-perceptual cortices) interact with each other during AM re-experiencing. All participants were interviewed with an Autobiographical Memory Interview to examine their episodic and semantic recall of specific events. Aphantasics reported more difficulties in recalling AM, were less confident about their memories, and described less internal and emotional details than controls. Neurally, aphantasics displayed decreased hippocampal and increased visual-perceptual cortex activation during AM retrieval compared to controls. In addition, aphantasics exhibited stronger connectivity between the hippocampus and the visual cortex during AM and at rest. Connectivity at rest showed opposite relations to visualization self-reports in the two participant groups. Our results indicate that visual mental imagery is essential for detailed-rich, vivid AM and that the functional connection between the hippocampus and visual-perceptual cortex is crucial for this type of retrieval. Significance Statement The current study unravels the role of visual mental imagery in episodic autobiographical memory (AM) retrieval. We show that a lack of mental imagery (= aphantasia) leads to less detailed memories. Neurally, this deficit is associated with hypoactivity in the hippocampus and hyperactivity in the visual-perceptual cortices, as well as hyperconnectivity between both structures. Future studies will show whether mental imagery training leads to changes in these structures and improves recall of AM, which in turn could be used in various disorders involving AM deficits such as dementia." @default.
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• W4385807598 date "2023-08-13" @default.
• W4385807598 modified "2023-10-17" @default.
• W4385807598 title "Hippocampal-occipital connectivity reflects autobiographical memory deficits in aphantasia" @default.
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• W4385807598 doi "https://doi.org/10.1101/2023.08.11.552915" @default.
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