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Brain Struct Funct ; 225(8): 2447-2461, 2020 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-32875354

RESUMEN

We investigated the visuotopic organization of macaque posterior parietal cortex (PPC) by combining functional imaging (fMRI) and wide-field retinotopic mapping in two macaque monkeys. Whole brain blood-oxygen-level-dependent (BOLD) signal was recorded while monkeys maintained central fixation during the presentation of large rotating wedges and expending/contracting annulus of a "shaking" fruit basket, designed to maximize the recruitment of PPC neurons. Results of the surface-based population receptive field (pRF) analysis reveal a new cluster of four visuotopic areas at the confluence of the parieto-occipital and intra-parietal sulci, in a location previously defined histologically and anatomically as the posterior intra-parietal (PIP) region. This PIP cluster groups together two recently described areas (CIP1/2) laterally and two newly identified ones (PIP1/2) medially, whose foveal representations merge in the fundus of the intra-parietal sulcus. The cluster shares borders with other visuotopic areas: V3d posteriorly, V3A/DP laterally, V6/V6A medially and LIP anteriorly. Together, these results show that monkey PPC is endowed with a dense set of visuotopic areas, as its human counterpart. The fact that fMRI and wide-field stimulation allows a functional parsing of monkey PPC offers a new framework for studying functional homologies with human PPC.


Asunto(s)
Fijación Ocular/fisiología , Lóbulo Parietal/diagnóstico por imagen , Vías Visuales/diagnóstico por imagen , Animales , Mapeo Encefálico/métodos , Femenino , Procesamiento de Imagen Asistido por Computador , Macaca mulatta , Imagen por Resonancia Magnética , Neuronas/fisiología , Lóbulo Parietal/fisiología , Estimulación Luminosa , Corteza Visual/diagnóstico por imagen , Corteza Visual/fisiología , Vías Visuales/fisiología
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