title: Correction of distortion in flattened representations of the cortical surface allows prediction of V1-V3 functional organization from anatomy.
abstract: Several domains of neuroscience offer map-like models that link location on the cortical surface to properties of sensory representation. Within cortical visual areas V1, V2, and V3, algebraic transformations can relate position in the visual field to the retinotopic representation on the flattened cortical sheet. A limit to the practical application of this structure-function model is that the cortex, while topologically a two-dimensional surface, is curved. Flattening of the curved surface to a plane unavoidably introduces local geometric distortions that are not accounted for in idealized models. Here, we show that this limitation is overcome by correcting the geometric distortion induced by cortical flattening. We use a mass-spring-damper simulation to create a registration between functional MRI retinotopic mapping data of visual areas V1, V2, and V3 and an algebraic model of retinotopy. This registration is then applied to the flattened cortical surface anatomy to create an anatomical template that is linked to the algebraic retinotopic model. This registered cortical template can be used to accurately predict the location and retinotopic organization of these early visual areas from cortical anatomy alone. Moreover, we show that prediction accuracy remains when extrapolating beyond the range of data used to inform the model, indicating that the registration reflects the retinotopic organization of visual cortex. We provide code for the mass-spring-damper technique, which has general utility for the registration of cortical structure and function beyond the visual cortex.
authors.affiliation: Department of Neurology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America; Department of Psychology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America.
authors.forename: Noah C
authors.initials: NC
authors.lastname: Benson
authors.affiliation: Department of Neurology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America.
authors.forename: Omar H
authors.initials: OH
authors.lastname: Butt
authors.affiliation: Department of Psychology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America.
authors.forename: David H
authors.initials: DH
authors.lastname: Brainard
authors.affiliation: Department of Neurology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America.
authors.forename: Geoffrey K
authors.initials: GK
authors.lastname: Aguirre
mesh_terms: D000328:Adult; D000465:Algorithms; D001931:Brain Mapping / Q000379:methods*; D003198:Computer Simulation; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008959:Models, Neurological; D008962:Models, Theoretical; D009778:Occipital Lobe / Q000502:physiology*; D015203:Reproducibility of Results; D013499:Surface Properties; D014793:Visual Cortex / Q000502:physiology*; D014794:Visual Fields; D014795:Visual Pathways; D055815:Young Adult