Key Points
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The early characterization of the cerebellar cortical microcircuit gave rise to the influential Marr–Albus framework for modelling cerebellar function. This framework has been used in adaptive-filter form in many cerebellar models.
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However, the initial characterization of the cerebellar microcircuitry in these models was far from complete, and the role of many microcircuit components was left unexplained. Subsequent technical advances have provided extensive new evidence concerning these components and their plasticity.
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Here the authors relate these advances to recent developments in understanding the computational bases of cerebellar adaptive-filter models, and conclude that there are striking parallels between theory and experiment in the domains of symmetrical long-term potentiation and long-term depression, silent parallel fibre synapses, interneuron plasticity and recurrent mossy fibre connectivity.
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This convergence encourages further collaboration between empirical and computational approaches in identifying the functional significance of features of the cerebellar microcircuit that are still poorly understood, in particular mossy fibre signalling and granular layer processing, and the nature of climbing fibre signals.
Abstract
Initial investigations of the cerebellar microcircuit inspired the Marr–Albus theoretical framework of cerebellar function. We review recent developments in the experimental understanding of cerebellar microcircuit characteristics and in the computational analysis of Marr–Albus models. We conclude that many Marr–Albus models are in effect adaptive filters, and that evidence for symmetrical long-term potentiation and long-term depression, interneuron plasticity, silent parallel fibre synapses and recurrent mossy fibre connectivity is strikingly congruent with predictions from adaptive-filter models of cerebellar function. This congruence suggests that insights from adaptive-filter theory might help to address outstanding issues of cerebellar function, including both microcircuit processing and extra-cerebellar connectivity.
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Acknowledgements
The support of the Biotechnology and Biological Research Council (United Kingdom), the Engineering and Physical Sciences Research Council (United Kingdom), EU FP6 (IST-028,056-SENSOPAC) and the Swedish Medical Research Council is gratefully acknowledged.
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Supplementary information
Supplementary information S1 (box)
Control architectures and the adaptive filter (PDF 415 kb)
Supplementary information S2 (box)
Adaptive-Filter details (PDF 1232 kb)
Supplementary information S3 (box)
Reduced preparations (PDF 279 kb)
Supplementary information S4 (box)
Granular layer (PDF 417 kb)
Supplementary information S5 (box)
Alternative models of cerebellar microcircuitry (PDF 230 kb)
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Glossary
- Purkinje cell
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By far the largest neuron of the cerebellum and the sole output of the cerebellar cortex. Receives climbing fibre input and integrates inputs from parallel fibres and interneurons.
- Climbing fibre
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(CF). Arises from cells in the inferior olive and provides an extraordinarily strong, 'climbing' multi-synaptic contact on Purkinje cells. However, branches of the olivocerebellar axon contact not only Purkinje cells but also other neuron types of the cerebellum. In the latter cases, there is no 'climbing' pattern in the anatomical configuration of the contacts. Nevertheless, for convenience, the input from the olivocerebellar axons to the interneurons is referred to as 'CF' input in the text.
- Mossy fibre
-
(MF). Provides the bulk of the afferent input to the cerebellum and originates from numerous sources in the spinal cord, brain stem and pontine nuclei (the latter mediating input from the cerebral cortex).
- Granule cell
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Integrates excitatory mossy fibre input from external sources and local inhibitory input from Golgi cells.
- Parallel fibre
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(PF). Arises from granule cells and provides excitatory input to Purkinje cells and molecular layer interneurons.
- Microzone
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A narrow longitudinal strip of the cerebellar cortex, just a few Purkinje cells wide but up to hundreds of Purkinje cells long, in which all the Purkinje cells receive climbing fibres driven by the same input.
- Vestibulo-ocular reflex
-
Reflex movement of the eyes elicited by vestibular stimulation. Its purpose is to keep the retinal image stable, preventing degradation of visual processing. The reflex is under the control of the floccular region of the cerebellum.
- Engineering control theory
-
A branch of engineering science concerned with the control of dynamic systems (including aircraft, chemical reactions and robots).
- Silent synapses
-
Synapses that can be structurally identified but which provide no synaptic currents in the postsynaptic cell.
- Golgi cell
-
Inhibitory interneurons in the granular layer that synapse with granule cells. They receive excitatory input from mossy fibres and parallel fibres.
- Glutamate uncaging
-
The process by which chemically caged glutamate can be released by focal light. It is used to study the effects of postsynaptic activation with high temporal and spatial control.
- Beam
-
A bundle of parallel fibres (PFs). A term typically applied to experiments using electrical stimulation of PFs in which the local population of PFs around the stimulating electrode is activated.
- Image slip
-
Movement of the entire image across the retina, usually produced by movement of the eyes.
- Distal error problem
-
The natural error signal for learning motor commands is the difference between actual and correct commands ('motor error'). However, in autonomous systems the correct command is typically unknown; only information about the sensory consequences of incorrect commands is available, such as the position of a pointing finger relative to a target ('distal error'). How to use this information to drive motor learning is the distal error (or motor error) problem.
- Coincidence detector
-
A neuron that acts as a coincidence detector responds only when two or more of its synaptic inputs are activated together.
- Hysteresis
-
A system has hysteresis when its current behaviour depends on its history. An example of hysteresis in learning is the phenomenon of savings, in which relearning takes place much more quickly than first-time learning.
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Dean, P., Porrill, J., Ekerot, CF. et al. The cerebellar microcircuit as an adaptive filter: experimental and computational evidence. Nat Rev Neurosci 11, 30–43 (2010). https://doi.org/10.1038/nrn2756
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DOI: https://doi.org/10.1038/nrn2756
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