Integration of Semi-Circular Canal and Otolith Cues for Direction Discrimination during Eccentric Rotations

PloS One
Florian SoykaMichael Barnett-Cowan

Abstract

Humans are capable of moving about the world in complex ways. Every time we move, our self-motion must be detected and interpreted by the central nervous system in order to make appropriate sequential movements and informed decisions. The vestibular labyrinth consists of two unique sensory organs the semi-circular canals and the otoliths that are specialized to detect rotation and translation of the head, respectively. While thresholds for pure rotational and translational self-motion are well understood surprisingly little research has investigated the relative role of each organ on thresholds for more complex motion. Eccentric (off-center) rotations during which the participant faces away from the center of rotation stimulate both organs and are thus well suited for investigating integration of rotational and translational sensory information. Ten participants completed a psychophysical direction discrimination task for pure head-centered rotations, translations and eccentric rotations with 5 different radii. Discrimination thresholds for eccentric rotations reduced with increasing radii, indicating that additional tangential accelerations (which increase with radius length) increased sensitivity. Two competing models were us...Continue Reading

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Citations

Apr 18, 2016·Biological cybernetics·Christopher J NashRobert S Bigler
Feb 10, 2017·Journal of Neurophysiology·Koeun LimDaniel M Merfeld
Jun 24, 2016·Journal of Neurophysiology·Benjamin T Crane
Jun 5, 2021·Neuroscience·Ana Diaz-Artiles, Faisal Karmali

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