Spinal corollary discharge modulates motion sensing during vertebrate locomotion

Boris P. Chagnaud (), Roberto Banchi, John Simmers and Hans Straka
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Boris P. Chagnaud: Ludwig-Maximilians-University Munich, Grosshadernerstrasse 2, 82152 Planegg-Martinsried, Germany
Roberto Banchi: Ludwig-Maximilians-University Munich, Grosshadernerstrasse 2, 82152 Planegg-Martinsried, Germany
John Simmers: Institut de Neurosciences Cognitives et Intégratives d'Aquitaine, Université de Bordeaux
Hans Straka: Ludwig-Maximilians-University Munich, Grosshadernerstrasse 2, 82152 Planegg-Martinsried, Germany

Nature Communications, 2015, vol. 6, issue 1, 1-14

Abstract: Abstract During active movements, neural replicas of the underlying motor commands may assist in adapting motion-detecting sensory systems to an animal’s own behaviour. The transmission of such motor efference copies to the mechanosensory periphery offers a potential predictive substrate for diminishing sensory responsiveness to self-motion during vertebrate locomotion. Here, using semi-isolated in vitro preparations of larval Xenopus, we demonstrate that shared efferent neural pathways to hair cells of vestibular endorgans and lateral line neuromasts express cyclic impulse bursts during swimming that are directly driven by spinal locomotor circuitry. Despite common efferent innervation and discharge patterns, afferent signal encoding at the two mechanosensory peripheries is influenced differentially by efference copy signals, reflecting the different organization of body/water motion-detecting processes in the vestibular and lateral line systems. The resultant overall gain reduction in sensory signal encoding in both cases, which likely prevents overstimulation, constitutes an adjustment to increased stimulus magnitudes during locomotion.

Date: 2015
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DOI: 10.1038/ncomms8982

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