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Computational Theory Underlying Acute Vestibulo-ocular Reflex Motor Learning with Cerebellar Long-Term Depression and Long-Term Potentiation

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Abstract

The vestibulo-ocular reflex (VOR) can be viewed as an adaptive control system that maintains compensatory eye movements during head motion. As the cerebellar flocculus is intimately involved in this adaptive motor control of the VOR, the VOR has been a popular model system for investigating cerebellar motor learning. Long-term depression (LTD) and long-term potentiation (LTP) at the parallel fiber–Purkinje cell synapses are considered to play major roles in cerebellar motor learning. A recent study using mutant mice demonstrated cerebellar motor learning with hampered LTD; the study concluded that the parallel fiber–Purkinje cell LTD is not essential. More recently, multiple forms of plasticity have been found in the cerebellum, and they are believed to contribute to cerebellar motor learning. However, it is still unclear how synaptic plasticity modifies the signal processing that underlies motor learning in the flocculus. A computational simulation suggested that the plasticity present in mossy fiber–granule cell synapses improves VOR-related sensory-motor information transferred into granule cells, whereas the plasticity in the molecular layer stores this information as a memory under guidance from climbing fiber teaching signals. Thus, motor learning and memory are thought to be induced mainly by LTD and LTP at parallel fiber–Purkinje cell synapses and by rebound potentiation at molecular interneuron–Purkinje cell synapses among the multiple forms of plasticity in the cerebellum. In this study, we focused on the LTD and LTP at parallel fiber–Purkinje cell synapses. Based on our simulation, we propose that acute VOR motor learning accomplishes by simultaneous enhancement of eye movement signals via LTP and suppression of vestibular signals via LTD to increase VOR gain (gain-up learning). To decrease VOR gain (gain-down learning), these two signals are modified in the opposite directions; namely, LTD suppresses eye movement signals, whereas LTP enhances vestibular signals.

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Acknowledgements

The authors would like to thank the late Prof. Stephen Highstein for his valuable comments. The authors also thank Dr. Josh Bassett for proofreading the manuscript. This study was supported in part by a JSPS KAKENHI Grant-in-Aid for Scientific Research (B) (24300115, YH) and a Grant-in-Aid for Young Scientists (B) (15K16086 and 17K12781, KI).

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  1. Department of Robotic Science and Technology, College of Engineering, Chubu University, 1200 Matsumoto, Kasugai, Aichi, 487-8501, Japan

    Keiichiro Inagaki & Yutaka Hirata

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  1. Keiichiro Inagaki
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Correspondence to Keiichiro Inagaki.

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Inagaki, K., Hirata, Y. Computational Theory Underlying Acute Vestibulo-ocular Reflex Motor Learning with Cerebellar Long-Term Depression and Long-Term Potentiation. Cerebellum 16, 827–839 (2017). https://doi.org/10.1007/s12311-017-0857-6

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