Developmentally Unique Cerebellar Processing Prioritizes Self- over Other-Generated Movements.

Autor:	Richardson AM; Interdisciplinary Graduate Program in Neuroscience, University of Iowa, Iowa City, Iowa 52242., Sokoloff G; Department of Psychological and Brain Sciences, University of Iowa, Iowa City, Iowa 52242.; Iowa Neuroscience Institute, University of Iowa, Iowa City, Iowa 52242., Blumberg MS; Interdisciplinary Graduate Program in Neuroscience, University of Iowa, Iowa City, Iowa 52242 mark-blumberg@uiowa.edu.; Department of Psychological and Brain Sciences, University of Iowa, Iowa City, Iowa 52242.; Iowa Neuroscience Institute, University of Iowa, Iowa City, Iowa 52242.
Jazyk:	angličtina
Zdroj:	The Journal of neuroscience : the official journal of the Society for Neuroscience [J Neurosci] 2024 May 08; Vol. 44 (19). Date of Electronic Publication: 2024 May 08.
DOI:	10.1523/JNEUROSCI.2345-23.2024
Abstrakt:	Animals must distinguish the sensory consequences of self-generated movements (reafference) from those of other-generated movements (exafference). Only self-generated movements entail the production of motor copies (i.e., corollary discharges), which are compared with reafference in the cerebellum to compute predictive or internal models of movement. Internal models emerge gradually over the first three postnatal weeks in rats through a process that is not yet fully understood. Previously, we demonstrated in postnatal day (P) 8 and P12 rats that precerebellar nuclei convey corollary discharge and reafference to the cerebellum during active (REM) sleep when pups produce limb twitches. Here, recording from a deep cerebellar nucleus (interpositus, IP) in P12 rats of both sexes, we compared reafferent and exafferent responses with twitches and limb stimulations, respectively. As expected, most IP units showed robust responses to twitches. However, in contrast with other sensory structures throughout the brain, relatively few IP units showed exafferent responses. Upon finding that exafferent responses occurred in pups under urethane anesthesia, we hypothesized that urethane inhibits cerebellar cortical cells, thereby disinhibiting exafferent responses in IP. In support of this hypothesis, ablating cortical tissue dorsal to IP mimicked the effects of urethane on exafference. Finally, the results suggest that twitch-related corollary discharge and reafference are conveyed simultaneously and in parallel to cerebellar cortex and IP. Based on these results, we propose that twitches provide opportunities for the nascent cerebellum to integrate somatotopically organized corollary discharge and reafference, thereby enabling the development of closed-loop circuits and, subsequently, internal models. Competing Interests: The authors declare no competing financial interests. (Copyright © 2024 the authors.)
Databáze:	MEDLINE
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