The causal role of the lateral occipital complex in visual mirror symmetry detection and grouping: an fMRI-guided TMS study

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
Silvia BonaZaira Cattaneo

Abstract

Despite the fact that bilateral mirror symmetry is an important characteristic of the visual world, few studies have investigated its neural basis. Here we addressed this issue by investigating whether the object-selective lateral occipital (LO) cortex, a key brain region in object and shape processing, is causally involved in bilateral symmetry detection. Participants were asked to discriminate between symmetric and asymmetric dot patterns, while fMRI-guided repetitive TMS was delivered online over either the left LO, the right LO or two control sites in the occipital cortex. We found that the application of TMS over both right and left LO impaired symmetry judgments, with disruption being greater following right LO than left LO TMS, indicative of right hemisphere lateralization in symmetry processing. TMS over LO bilaterally also affected a visual contour detection task, with no evidence for hemispheric difference in this task. Overall, our results demonstrates that LO bilaterally plays a causal role in symmetry detection possibly due to symmetry acting as a strong cue in Gestalt processes mediating object recognition.

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Citations

Oct 18, 2015·Vision Research·Letizia PalumboAlexis Makin
Sep 23, 2014·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Corinna BauerLotfi B Merabet
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Sep 19, 2019·The European Journal of Neuroscience·Alexis D J MakinMarco Bertamini
Sep 9, 2020·The European Journal of Neuroscience·Alexis D J MakinMarco Bertamini
Sep 27, 2020·Brain Sciences·Luca RinaldiZaira Cattaneo
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Mar 7, 2021·The European Journal of Neuroscience·Alexis D J MakinMarco Bertamini
Jul 17, 2021·Vision Research·Giulia RamponeMarco Bertamini
Oct 8, 2021·Cerebral Cortex·Pauline AudurierBenoit R Cottereau

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