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The fornix supports episodic memory during childhood

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Ngo, Chi T.
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Canada, Kelsey L.
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Pasternak, Ofer
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Zhang, Fan
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Riggins, Tracy
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Journal article
Date
2022-02-15
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Psychology and Neuroscience
Subject
Fornix
 Memory development
 Tractography
 Uncinate
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http://hdl.handle.net/20.500.12613/10362
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HoffmanEtAl-JournalArticle-2022-02.pdf
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http://dx.doi.org/10.1093/cercor/bhac022
Abstract
Episodic memory relies on the coordination of widespread brain regions that reconstruct spatiotemporal details of an episode. These topologically dispersed brain regions can rapidly communicate through structural pathways. Research in animal and human lesion studies implicate the fornix—the major output pathway of the hippocampus—in supporting various aspects of episodic memory. Because episodic memory undergoes marked changes in early childhood, we tested the link between the fornix and episodic memory in an age window of robust memory development (ages 4–8 years). Children were tested on the stories subtest from the Children’s Memory Scale, a temporal order memory task, and a source memory task. Fornix streamlines were reconstructed using probabilistic tractography to estimate fornix microstructure. In addition, we measured fornix macrostructure and computed free water. To assess selectivity of our findings, we also reconstructed the uncinate fasciculus. Findings show that children’s memory increases from ages 4 to 8 and that fornix micro- and macrostructure increases between ages 4 and 8. Children’s memory performance across nearly every memory task correlated with individual differences in fornix, but not uncinate fasciculus, white matter. These findings suggest that the fornix plays an important role in supporting the development of episodic memory, and potentially semantic memory, in early childhood.
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Citation
Linda J Hoffman, Chi T Ngo, Kelsey L Canada, Ofer Pasternak, Fan Zhang, Tracy Riggins, Ingrid R Olson, The fornix supports episodic memory during childhood, Cerebral Cortex, Volume 32, Issue 23, 1 December 2022, Pages 5388–5403, https://doi.org/10.1093/cercor/bhac022
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Oxford University Press
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Cerebral Cortex, Vol. 32, Iss. 23
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