A common neural substrate for processing scenes and egomotion-compatible visual motion
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ORIGINAL ARTICLE
A common neural substrate for processing scenes and egomotion‑compatible visual motion Valentina Sulpizio1,2 · Gaspare Galati2,3 · Patrizia Fattori1 · Claudio Galletti1 · Sabrina Pitzalis2,4 Received: 5 February 2020 / Accepted: 2 July 2020 © The Author(s) 2020
Abstract Neuroimaging studies have revealed two separate classes of category-selective regions specialized in optic flow (egomotioncompatible) processing and in scene/place perception. Despite the importance of both optic flow and scene/place recognition to estimate changes in position and orientation within the environment during self-motion, the possible functional link between egomotion- and scene-selective regions has not yet been established. Here we reanalyzed functional magnetic resonance images from a large sample of participants performing two well-known “localizer” fMRI experiments, consisting in passive viewing of navigationally relevant stimuli such as buildings and places (scene/place stimulus) and coherently moving fields of dots simulating the visual stimulation during self-motion (flow fields). After interrogating the egomotionselective areas with respect to the scene/place stimulus and the scene-selective areas with respect to flow fields, we found that the egomotion-selective areas V6+ and pIPS/V3A responded bilaterally more to scenes/places compared to faces, and all the scene-selective areas (parahippocampal place area or PPA, retrosplenial complex or RSC, and occipital place area or OPA) responded more to egomotion-compatible optic flow compared to random motion. The conjunction analysis between scene/place and flow field stimuli revealed that the most important focus of common activation was found in the dorsolateral parieto-occipital cortex, spanning the scene-selective OPA and the egomotion-selective pIPS/V3A. Individual inspection of the relative locations of these two regions revealed a partial overlap and a similar response profile to an independent low-level visual motion stimulus, suggesting that OPA and pIPS/V3A may be part of a unique motion-selective complex specialized in encoding both egomotion- and scene-relevant information, likely for the control of navigation in a structured environment. Keywords Optic flow · Scene perception · Functional magnetic resonance · Brain mapping · OPA · V3A
Introduction
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00429-020-02112-8) contains supplementary material, which is available to authorized users. * Valentina Sulpizio [email protected] 1
Department of Biomedical and Neuromotor Sciences‑DIBINEM, University of Bologna, Piazza di Porta San Donato 2, 40126 Bologna, Italy
2
Department of Cognitive and Motor Rehabilitation and Neuroimaging, Santa Lucia Foundation (IRCCS Fondazione Santa Lucia), Rome, Italy
3
Brain Imaging Laboratory, Department of Psychology, Sapienza University, Rome, Italy
4
Department of Movement, Human and Health Sciences, University of Rome ‘‘Foro Italico’’, Rome,
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