Journal article
Developmental Changes in Evoked Purkinje Cell Complex Spike Responses
Journal of neurophysiology, Vol.90(4), pp.2349-2357
10/2003
DOI: 10.1152/jn.00481.2003
PMID: 12867530
Abstract
The development of synaptic interconnections between the cerebellum and inferior olive, the sole source of climbing fibers, could contribute to the ontogeny of certain forms of motor learning (e.g., eyeblink conditioning). Purkinje cell complex spikes are produced exclusively by climbing fibers and exhibit short- and long-latency activity in response to somatosensory stimulation. Previous studies have demonstrated that evoked short- and long-latency complex spikes generally occur on separate trials and that this response segregation is regulated by inhibitory feedback to the inferior olive. The present experiment tested the hypothesis that complex spikes evoked by periorbital stimulation are regulated by inhibitory feedback from the cerebellum and that this feedback develops between postnatal days (PND) 17 and 24. Recordings from individual Purkinje cell complex spikes in urethan-anesthetized rats indicated that the segregation of short- and long-latency evoked complex spike activity emerges between PND17 and PND24. In addition, infusion of picrotoxin, a GABAA-receptor antagonist, into the inferior olive abolished the response pattern segregation in PND24 rats, producing evoked complex spike response patterns similar to those characteristic of younger rats. These data support the view that cerebellar feedback to the inferior olive, which is exclusively inhibitory, undergoes substantial changes in the same developmental time window in which certain forms of motor learning emerge.
Details
- Title: Subtitle
- Developmental Changes in Evoked Purkinje Cell Complex Spike Responses
- Creators
- Daniel A Nicholson - Department of Psychology, University of Iowa, Iowa City, Iowa 52242John H Freeman - Department of Psychology, University of Iowa, Iowa City, Iowa 52242
- Resource Type
- Journal article
- Publication Details
- Journal of neurophysiology, Vol.90(4), pp.2349-2357
- DOI
- 10.1152/jn.00481.2003
- PMID
- 12867530
- ISSN
- 0022-3077
- eISSN
- 1522-1598
- Language
- English
- Date published
- 10/2003
- Academic Unit
- Psychological and Brain Sciences; Iowa Neuroscience Institute
- Record Identifier
- 9984065862002771
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