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    Area of Science:

    • Neuroscience
    • Vision Science
    • Spatial Cognition

    Background:

    • Humans can accurately perceive the locations of static objects while walking, despite continuous retinal image motion.
    • Understanding the neural mechanisms underlying stable spatial perception during locomotion is crucial for vision science.

    Approach:

    • Researchers measured perceived target locations after observers walked a short distance from a starting point.
    • The study investigated whether the spatial reference frame remains fixed or moves with the observer.
    • An intrinsic bias, acting as a spatial reference frame for dimly lit targets, was analyzed.

    Key Points:

    • The brain adopts an allocentric spatial reference frame to maintain stable object location perception during walking.
    • The intrinsic spatial bias remained fixed at the starting location, supporting an allocentric coding scheme.
    • Path integration, used for spatial updating, incorporates active and passive motion signals, but is directionally anisotropic (horizontal only).

    Conclusions:

    • The allocentric reference frame allows for reliable navigation and object interaction despite optic flow.
    • Anisotropic path integration in human spatial perception mirrors findings in desert ants, suggesting conserved natural designs.