Stereomotion processing in the non-human primate brain

  1. Samy Rima
  2. Emilie Rapha
  3. Jean-Baptiste Durand
  4. Benoit R. Cottereau

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Description: The cortical areas that process disparity-defined motion-in-depth (i.e., cyclopean stereomotion [CSM]) were characterised with functional magnetic resonance imaging (fMRI) in two awake, behaving macaques. The experimental protocol was similar to previous human neuroimaging studies.We contrasted the responses to dynamic random-dot patterns that continuously changed their binocular disparity over time with those to a control condition that shared the same properties, except that the temporal frames were shuffled. A whole-brain voxel-wise analysis revealed that in all four cortical hemispheres, three areas showed consistent sensitivity to CSM. Two of them were localized respectively in the lower bank of the superior temporal sulcus (CSM_STS) and on the neighbouring infero-temporal gyrus (CSM_ITG). The third area was situated in the posterior parietal cortex (CSM_PPC). Additional regions of interest-based analyses within retinotopic areas defined in both animals indicated weaker but significant responses to CSM within the MT cluster (most notably in areas MSTv and FST). Altogether, our results are in agreement with previous findings in both human and macaque and suggest that the cortical areas that process CSM are relatively well preserved between the two primate species.

License: CC0 1.0 Universal


Content: - Manuscript: contains the accepted version of the manuscript, also available on biorxiv, as well as the supplementary material - PSC_data: contains the BOLD response to our different conditions in the form of a Percentage of Signal Change (PSC) for our two subjects and for the different analyses that were performed in the paper (our 3 regions of interest, the retinotopic analyses, and th...


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