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XB-ART-53169
J Neurol 2017 Oct 01;264Suppl 1:28-33. doi: 10.1007/s00415-017-8437-8.
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Moving or being moved: that makes a difference.

Straka H , Chagnaud BP .


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During head/body movements, gaze stability is ensured by transformation of motion-related sensory signals into respective motor commands. Passively induced motion in all vertebrates including amphibians evokes a robust vestibulo-ocular reflex, suggesting an equally important role of this motor reaction during actively induced motion. However, during self-induced movements including locomotion, motor efference copies offer a convenient additional substrate for counteracting retinal image displacements. During such locomotor activity in Xenopus laevis tadpoles, spinal central pattern generator-derived efference copies elicit spatio-temporally specific eye movements, which are functionally appropriate to offset swimming-related retinal image displacements. In addition, passively induced horizontal semicircular canal signals are suppressed, making intrinsic spino-extraocular motor coupling the dominating mechanism for gaze stabilization during locomotion. The presence of functionally appropriate efference copy-driven eye movements in adult frogs with limb-based locomotion suggests that this mechanism might play a role for gaze stability during rhythmic locomotion also in other vertebrates.

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Species referenced: Xenopus laevis
Genes referenced: ppp1r9b

References [+] :
Angelaki, Vestibular system: the many facets of a multimodal sense. 2008, Pubmed