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Related Experiment Video

Updated: Apr 11, 2026

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
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Bat eye movements resolve a long-standing question in gaze control.

Hui Ho Vanessa Chang, Grace Capshaw, Dimitri Skandalis

    Biorxiv : the Preprint Server for Biology
    |April 10, 2026
    PubMed
    Summary

    Bats possess robust eye movements, demonstrating strong visual and otolith-driven gaze stabilization. Their minimal semicircular canal-driven responses suggest specialized adaptations for flight.

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    Area of Science:

    • Neuroscience
    • Comparative Physiology
    • Sensory Systems Biology

    Background:

    • Eye movements are crucial for visual information gathering and gaze stabilization via optokinetic (OKR) and vestibulo-ocular reflex (VOR) pathways.
    • Bats were previously assumed to lack eye movements, a notion unsupported by empirical data.

    Purpose of the Study:

    • To quantitatively analyze eye movements in Seba's short-tailed bat (Carollia perspicillata) in response to visual and vestibular stimuli.
    • To investigate the functional role of OKR and VOR pathways in bat gaze stabilization.

    Main Methods:

    • Quantitative analysis of eye movements in response to visual and vestibular stimulation.
    • Micro-CT scans for semicircular canal geometry comparison between bats and mice.

    Main Results:

    • Bats exhibit robust, visually driven OKR (∼±10° oculomotor range) and strong otolith-mediated responses.
    • Minimal semicircular canal-driven angular VOR (aVOR) was observed during passive head rotations.
    • Semicircular canal anatomy in bats is similar to mice, ruling out peripheral constraints for weak aVOR.

    Conclusions:

    • Bats demonstrate significant eye movements and effective gaze stabilization through visual and otolith pathways.
    • The limited aVOR suggests specialized vestibular processing in bats, potentially for active flight and behavioral states.