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Egomotion-related visual areas respond to goal-directed movements

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Abstract

Integration of proprioceptive signals from the various effectors with visual feedback of self-motion from the retina is necessary for whole-body movement and locomotion. Here, we tested whether the human visual motion areas involved in processing optic flow signals simulating self-motion are also activated by goal-directed movements (as saccades or pointing) performed with different effectors (eye, hand, and foot), suggesting a role in visually guiding movements through the external environment. To achieve this aim, we used a combined approach of task-evoked activity and effective connectivity (PsychoPhysiological Interaction, PPI) by fMRI. We localized a set of six egomotion-responsive visual areas through the flow field stimulus and distinguished them into visual (pIPS/V3A, V6+ , IPSmot/VIP) and visuomotor (pCi, CSv, PIC) areas according to recent literature. We tested their response to a visuomotor task implying spatially directed delayed eye, hand, and foot movements. We observed a posterior-to-anterior gradient of preference for eye-to-foot movements, with posterior (visual) regions showing a preference for saccades, and anterior (visuomotor) regions showing a preference for foot pointing. No region showed a clear preference for hand pointing. Effective connectivity analysis showed that visual areas were more connected to each other with respect to the visuomotor areas, particularly during saccades. We suggest that visual and visuomotor egomotion regions can play different roles within a network that integrates sensory–motor signals with the aim of guiding movements in the external environment.

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Present data will be made available on request in compliance with the requirements of the funding institutes, and with the institutional ethics approval.

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Funding

The work was supported by the University of Rome ‘Foro Italico’, Italy, grant to Sabrina Pitzalis (CDR2.FFABR), and by the University of Bologna (MIUR-PRIN 2017 KZNZLN).

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Contributions

All authors had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Conceptualization: MB, VS, PF, CG, GG, TM, and SP; methodology: MB, VS, and SP; software: GG; investigation: MB, VS, and SP; formal analysis: MB and VS; writing—original draft: MB, VS, and SP; writing—review and editing: MB, VS, PF, CG, GG, TM, and SP; visualization: MB, VS and TM; supervision; VS, CG, and SP; funding acquisition: CG, PF, and SP.

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Correspondence to Sabrina Pitzalis.

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Conflict of interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Ethical approval

This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the ethics committee at Fondazione Santa Lucia in Rome (Date: 2014; No CE/PROG:441).

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Informed consent was obtained from all individual participants included in the study.

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Bellagamba, M., Sulpizio, V., Fattori, P. et al. Egomotion-related visual areas respond to goal-directed movements. Brain Struct Funct 227, 2313–2328 (2022). https://doi.org/10.1007/s00429-022-02523-9

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  • DOI: https://doi.org/10.1007/s00429-022-02523-9

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