Stereomotion Processing in the Nonhuman Primate Brain

Héjja-Brichard, Yseult; Rima, Samy; Rapha, Emilie; Durand, Jean-Baptiste; Cottereau, Benoit R.

doi:10.1093/cercor/bhaa055

Cited by 13 publications

(17 citation statements)

References 55 publications

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“…Indeed, we measured significant responses to reflection and rotation symmetry in a large network of areas which, as we will discuss below, is very consistent with the set of areas found in humans. This was found using BOLD measurements at 3 Teslas with a number of runs in line with the one used in previous studies from our group (30,16). BOLD responses to symmetric patterns were consistent in area V2 (t-scores > 3)…”

Section: Discussionsupporting

confidence: 88%

“…For our two animals, we used a population receptive field (pRF) analysis to define visual areas V1, V2, V3, V3A and V4 on the individual cortical surfaces from the data collected during an independent wide-field retinotopic experiment (see ref. (16) and (17)). The same data were used to define the MT and PIP clusters and their satellite sub-regions (V4t, MT, MSTv and FST for the MT cluster and CIP1, CIP2, PIP1 and PIP2 for the PIP cluster).…”

Section: Data Processingmentioning

confidence: 99%

“…visual display, eye monitoring and water reward) was controlled using the EventIDE software (Okazolab). estimated from each of the two monkeys (see details in ref 16…”

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confidence: 99%

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Symmetry processing in the macaque visual cortex

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Héjja-Brichard

Castro

et al. 2021

Preprint

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Symmetry is a highly salient feature of the natural world that is perceived by many species of the animal kingdom and that impacts a large array of behaviours such as partner selection or food choice. In humans, the cerebral areas processing symmetry are now well identified from neuroimaging measurements. However, we currently lack an animal model to explore the underlying neural mechanisms. Macaque is a potentially good candidate, but a previous comparative study (1) found that functional magnetic resonance imaging (fMRI) responses to mirror symmetry in this species were substantially weaker than those observed in humans under similar experimental conditions. Here, we re-examined symmetry processing in macaques from a broader perspective, using both rotation (experiment 1) and reflection (experiment 2) symmetry. Our experimental design was directly derived from that of a previous human fMRI study (2), in order to facilitate the comparison between the two primate species. Highly consistent responses to symmetry were found in a large network of areas (notably V3, V3A, V4, V4A and PITd), in line with what has been observed in humans. Within this network, response properties in areas V3 and V4 (notably their dependency on the rotation symmetry order) were strikingly similar to those observed in their human counterparts. Our results suggest that the cortical networks that process symmetry in humans and macaques are much more similar than previously reported and point toward macaque as a relevant model for understanding symmetry processing.

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Section: Discussionsupporting

confidence: 88%

Section: Data Processingmentioning

confidence: 99%

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Symmetry processing in the macaque visual cortex

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Héjja-Brichard

Castro

et al. 2021

Preprint

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“…We have little elements to provide regarding the functional role(s) of CIP1/2 and PIP1/2, except that they do not seem to be particularly involved in processing visual motion (Héjja-Brichard et al 2020 ), by contrast with the neighboring V6/V6A complex. Future investigations will have to clarify this issue, but we can nevertheless speculate that CIP1 and/or CIP2 are likely to process static 3D slants defined by binocular disparity or other depth cues (Tsutsui et al 2005 ; Durand et al 2007 ; Rosenberg et al 2013 ).…”

Section: Discussionmentioning

confidence: 99%

“…However, those single cell recordings failed to note any visuotopic organization, illustrating the higher sensitivity of fMRI for revealing large scale organization of the receptive fields in high-order areas (Patel et al 2010 ). Recent findings suggest that PIP1 and/or PIP2 might also be involved in visuospatial functions (Premereur et al 2015 ; Van Dromme et al 2016 ), most notably in cyclopean stereomotion processing (Héjja-Brichard et al 2020 ).…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2020

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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 expending/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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Optic flow selectivity in the macaque parieto-occipital sulcus

et al. 2021

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In humans, several neuroimaging studies have demonstrated that passive viewing of optic flow stimuli activates higher-level motion areas, like V6 and the cingulate sulcus visual area (CSv). In macaque, there are few studies on the sensitivity of V6 and CSv to egomotion compatible optic flow. The only fMRI study on this issue revealed selectivity to egomotion compatible optic flow in macaque CSv but not in V6 (Cotterau et al, 2017, but see Fan et al. 2015). Yet, it is unknown whether monkey visual motion areas MT+ and V6 display any distinctive fMRI functional profile relative to the optic flow stimulation, as it is the case for the homologous human areas (Pitzalis et al., 2010). Here, we described the sensitivity of the monkey brain to two motion stimuli (Radial Rings and Flow Fields) originally used in humans to functionally map the motion middle temporal area MT+ (Tootell et al. 1995a,b) and the motion medial parietal area V6 (Pitzalis et al. 2010), respectively. In both animals, we found regions responding only to optic flow or Radial Rings stimulation, and regions responding to both stimuli. A region in the parieto occipital sulcus (likely including V6) was one of the most highly selective area for coherently moving fields of dots, further demonstrating the power of this type of stimulation to activate V6 in both humans and monkeys. We did not find any evidence that putative macaque CSv responds to Flow Fields.

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Stereomotion Processing in the Nonhuman Primate Brain

Cited by 13 publications

References 55 publications

Symmetry processing in the macaque visual cortex

Symmetry processing in the macaque visual cortex

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

Optic flow selectivity in the macaque parieto-occipital sulcus

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