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• W2997235851 abstract "The oculomotor integrator (OI) in the vertebrate hindbrain transforms eye velocity input into persistent position coding output, which plays a crucial role in retinal image stability. For a mechanistic understanding of the integrator function and eye position control, knowledge about the tuning of the OI and other oculomotor nuclei is needed. Zebrafish are increasingly used to study integrator function and sensorimotor circuits, yet the precise neuronal tuning to motor variables remains uncharacterized.Here, we recorded cellular calcium signals while evoking monocular and binocular optokinetic eye movements at different slow-phase eye velocities. Our analysis reveals the anatomical distributions of motoneurons and internuclear neurons in the nucleus abducens as well as those of oculomotor neurons in caudally adjacent hindbrain volumes. Each neuron is tuned to eye position and/or velocity to variable extents and is only activated after surpassing particular eye position and velocity thresholds. While the abducens (rhombomeres 5/6) mainly codes for eye position, in rhombomeres 7/8, a velocity-to-position coding gradient exists along the rostro-caudal axis, which likely corresponds to the oculomotor structures storing velocity and position, and is in agreement with a feedforward mechanism of persistent activity generation. Position encoding neurons are recruited at eye position thresholds distributed across the behaviourally relevant dynamic range, while velocity-encoding neurons have more centred firing thresholds for velocity. In the abducens, neurons coding exclusively for one eye intermingle with neurons coding for both eyes. Many of these binocular neurons are preferentially active during conjugate eye movements and less active during monocular eye movements. This differential recruitment during monocular versus conjugate tasks represents a functional diversification in the final common motor pathway.We localized and functionally characterized the repertoire of oculomotor neurons in the zebrafish hindbrain. Our findings provide evidence for a mixed but task-specific binocular code and suggest that generation of persistent activity is organized along the rostro-caudal axis in the hindbrain." @default.
• W2997235851 created "2020-01-10" @default.
• W2997235851 creator A5038329271 @default.
• W2997235851 creator A5086228847 @default.
• W2997235851 creator A5089510218 @default.
• W2997235851 date "2019-12-01" @default.
• W2997235851 modified "2023-10-01" @default.
• W2997235851 title "Functional architecture underlying binocular coordination of eye position and velocity in the larval zebrafish hindbrain" @default.
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• W2997235851 doi "https://doi.org/10.1186/s12915-019-0720-y" @default.
• W2997235851 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6936144" @default.
• W2997235851 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31884959" @default.
• W2997235851 hasPublicationYear "2019" @default.
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