December 2022
Volume 22, Issue 14
Open Access
Vision Sciences Society Annual Meeting Abstract  |   December 2022
Cortical correlates of transsaccadic object orientation vs. shape change discrimination: an fMRI study
Author Affiliations
  • Bianca Baltaretu
    Justus Liebig University Giessen
    York University
  • W. Dale Stevens
    York University
  • Erez Freud
    York University
  • J. Douglas Crawford
    York University
Journal of Vision December 2022, Vol.22, 4162. doi:https://doi.org/10.1167/jov.22.14.4162
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      Bianca Baltaretu, W. Dale Stevens, Erez Freud, J. Douglas Crawford; Cortical correlates of transsaccadic object orientation vs. shape change discrimination: an fMRI study. Journal of Vision 2022;22(14):4162. https://doi.org/10.1167/jov.22.14.4162.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Previously, Dunkley et al. (2016) showed transsaccadic perception effects in parietal cortex (i.e., supramarginal gyrus, SMG) for object orientation, whereas Baltaretu et al. (2021) implicated occipital cortex (cuneus) in transsaccadic spatial frequency perception. Based on this, we hypothesized a fundamental difference transsaccadic detection of object orientation vs. identity. To test this, we used a double-dissociation fMRI task to examine transsaccadic discrimination of object orientation vs. shape change and examined the functional networks involved. 21 participants fixated a cross ±15.4° of centre, where an object was subsequently presented (rectangle, barrel, or hourglass) oriented at ±45° from vertical. The fixation cross remained in the same position (Fixation condition) or shifted (Saccade condition), followed by the same object re-presented at the orthogonal orientation (Orientation change) or another object at the initial orientation (Shape change). Change in object orientation or shape in each trial was indicated via button press. A region-of-interest analysis on two regions (SMG and cuneus) showed transsaccadic discrimination of multiple object features in SMG, as well as significant eye movement and feature sensitivity in cuneus. Subsequent functional connectivity analysis with cuneus as the seed region showed connections with early-to-mid-level visual (e.g., lingual gyrus, superior occipital gyrus), object-relevant (e.g., medial occipitotemporal sulcus, transverse occipital sulcus), and oculo/sensorimotor (i.e., superior parieto-occipital cortex) regions. These results implicate posterior parietal cortex and medial occipital cortex in the transsaccadic discrimination of multiple object features, with additional recruitment of parietal and temporal regions.

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