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Altered grid-like coding in early blind people

Author

Listed:
  • Federica Sigismondi

    (University of Trento)

  • Yangwen Xu

    (University of Trento
    Max Planck Institute for Human Cognitive and Brain Sciences)

  • Mattia Silvestri

    (University of Trento)

  • Roberto Bottini

    (University of Trento)

Abstract

Cognitive maps in the hippocampal-entorhinal system are central for the representation of both spatial and non-spatial relationships. Although this system, especially in humans, heavily relies on vision, the role of visual experience in shaping the development of cognitive maps remains largely unknown. Here, we test sighted and early blind individuals in both imagined navigation in fMRI and real-world navigation. During imagined navigation, the Human Navigation Network, constituted by frontal, medial temporal, and parietal cortices, is reliably activated in both groups, showing resilience to visual deprivation. However, neural geometry analyses highlight crucial differences between groups. A 60° rotational symmetry, characteristic of a hexagonal grid-like coding, emerges in the entorhinal cortex of sighted but not blind people, who instead show a 90° (4-fold) symmetry, indicative of a square grid. Moreover, higher parietal cortex activity during navigation in blind people correlates with the magnitude of 4-fold symmetry. In sum, early blindness can alter the geometry of entorhinal cognitive maps, possibly as a consequence of higher reliance on parietal egocentric coding during navigation.

Suggested Citation

  • Federica Sigismondi & Yangwen Xu & Mattia Silvestri & Roberto Bottini, 2024. "Altered grid-like coding in early blind people," Nature Communications, Nature, vol. 15(1), pages 1-15, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47747-x
    DOI: 10.1038/s41467-024-47747-x
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    References listed on IDEAS

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