Abstract:
:Inhibition of granule cells plays a key role in gating the flow of signals into the cerebellum, and it is thought that Golgi cells are the only interneurons that inhibit granule cells. Here we show that Purkinje cells, the sole output neurons of the cerebellar cortex, also directly inhibit granule cells via their axon collaterals. Anatomical and optogenetic studies indicate that this non-canonical feedback is region specific: it is most prominent in lobules that regulate eye movement and process vestibular information. Collaterals provide fast, slow, and tonic inhibition to granule cells, and thus allow Purkinje cells to regulate granule cell excitability on multiple timescales. We propose that this feedback mechanism could regulate excitability of the input layer, contribute to sparse coding, and mediate temporal integration.
journal_name
Neuronjournal_title
Neuronauthors
Guo C,Witter L,Rudolph S,Elliott HL,Ennis KA,Regehr WGdoi
10.1016/j.neuron.2016.08.011subject
Has Abstractpub_date
2016-09-21 00:00:00pages
1330-1341issue
6eissn
0896-6273issn
1097-4199pii
S0896-6273(16)30503-7journal_volume
91pub_type
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