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Article Dans Une Revue Brain Structure and Function Année : 2020

Wide-field retinotopy reveals a new visuotopic cluster in macaque posterior parietal cortex

Résumé

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 expend-ing/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.
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Dates et versions

hal-02990500 , version 1 (05-11-2020)

Identifiants

Citer

Samy Rima, Benoit Cottereau, Yseult Héjja-Brichard, Yves Trotter, Jean-Baptiste Durand. Wide-field retinotopy reveals a new visuotopic cluster in macaque posterior parietal cortex. Brain Structure and Function, 2020, 225 (8), pp.2447 - 2461. ⟨10.1007/s00429-020-02134-2⟩. ⟨hal-02990500⟩
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