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The missing pathway in current visuospatial processing models

Authors :
De Santiago Requejo F
Dominic Ffytche
Flavio Dell'Acqua
Ahmad Beyh
ZappalĂ  G
Cancemi D
Marco Catani
Sestieri C
Della Sala S
Caulo M
Publication Year :
2021
Publisher :
Cold Spring Harbor Laboratory, 2021.

Abstract

SummaryVisuospatial learning depends on the parahippocampal place area (PPA), a functionally heterogenous area which current visuospatial processing models place downstream from parietal cortex and only from area V4 of early visual cortex (EVC). However, evidence for anatomical connections between the PPA and other EVC areas is inconsistent, and these connections are not discussed in current models. Through a data-driven analysis based on diffusion MRI tractography, we present evidence that the PPA sits at the confluence of two white matter systems. The first conveys information from the retrosplenial complex to the anterior PPA and runs within the cingulum bundle. The second system connects all peripheral EVC areas to the posterior PPA and corresponds to the medial occipital longitudinal tract (MOLT), a novel white matter pathway distinct from the cingulum. Based on further functional connectivity analysis and meta-analytic data, we propose that the MOLT supports early stage encoding of visuospatial information by allowing direct reciprocal exchange between the PPA and EVC.

Details

Database :
OpenAIRE
Accession number :
edsair.doi...........25f63ce8a4d1bd4a53090e4ef7cf4fb7
Full Text :
https://doi.org/10.1101/2021.06.08.442147