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Cerebellar Cortex 4-12 Hz Oscillations and Unit Phase Relation in the Awake Rat.

Author(s): Lévesque M; Gao H; Southward C; Langlois JMP; Léna C; Courtemanche R;

Oscillations in the granule cell layer (GCL) of the cerebellar cortex have been related to behavior and could facilitate communication with the cerebral cortex. These local field potential (LFP) oscillations, strong at 4-12 Hz in the rodent cerebellar corte...

Article GUID: 33240052
State-Dependent Entrainment of Prefrontal Cortex Local Field Potential Activity Following Patterned Stimulation of the Cerebellar Vermis.

Author(s): Tremblay SA, Chapman CA, Courtemanche R

Front Syst Neurosci. 2019;13:60 Authors: Tremblay SA, Chapman CA, Courtemanche R

Article GUID: 31736718
Time for new thinking about sensitive periods

Author(s): Penhune V; de Villers-Sidani E;

No abstract available

Article GUID: 24782723
Diurnal influences on electrophysiological oscillations and coupling in the dorsal striatum and cerebellar cortex of the anesthetized rat.

Author(s): Frederick A, Bourget-Murray J, Chapman CA, Amir S, Courtemanche R

Front Syst Neurosci. 2014;8:145 Authors: Frederick A, Bourget-Murray J, Chapman CA, Amir S, Courtemanche R

Article GUID: 25309348
Title:Diurnal influences on electrophysiological oscillations and coupling in the dorsal striatum and cerebellar cortex of the anesthetized rat.
Authors:Frederick A,  Bourget-Murray J,  Chapman CA,  Amir S,  Courtemanche R
Link:https://www.ncbi.nlm.nih.gov/pubmed/25309348?dopt=Abstract
Category:Front Syst Neurosci
PMID:25309348
Dept Affiliation: BIOLOGY
1 Center for Studies in Behavioral Neurobiology/FRQS Groupe de Recherche en Neurobiologie Comportementale, Concordia University Montreal, QC, Canada ; Department of Biology, Concordia University Montreal, QC, Canada.
2 Center for Studies in Behavioral Neurobiology/FRQS Groupe de Recherche en Neurobiologie Comportementale, Concordia University Montreal, QC, Canada ; M.D., C.M. Program, Faculty of Medicine, McGill University Montreal, QC, Canada.
3 Center for Studies in Behavioral Neurobiology/FRQS Groupe de Recherche en Neurobiologie Comportementale, Concordia University Montreal, QC, Canada ; Department of Psychology, Concordia University Montreal, QC, Canada.
4 Center for Studies in Behavioral Neurobiology/FRQS Groupe de Recherche en Neurobiologie Comportementale, Concordia University Montreal, QC, Canada ; Department of Exercise Science, Concordia University Montreal, QC, Canada.

Description:

Diurnal influences on electrophysiological oscillations and coupling in the dorsal striatum and cerebellar cortex of the anesthetized rat.

Front Syst Neurosci. 2014;8:145

Authors: Frederick A, Bourget-Murray J, Chapman CA, Amir S, Courtemanche R

Abstract

Circadian rhythms modulate behavioral processes over a 24 h period through clock gene expression. What is largely unknown is how these molecular influences shape neural activity in different brain areas. The clock gene Per2 is rhythmically expressed in the striatum and the cerebellum and its expression is linked with daily fluctuations in extracellular dopamine levels and D2 receptor activity. Electrophysiologically, dopamine depletion enhances striatal local field potential (LFP) oscillations. We investigated if LFP oscillations and synchrony were influenced by time of day, potentially via dopamine mechanisms. To assess the presence of a diurnal effect, oscillatory power and coherence were examined in the striatum and cerebellum of rats under urethane anesthesia at four different times of day zeitgeber time (ZT1, 7, 13 and 19-indicating number of hours after lights turned on in a 12:12 h light-dark cycle). We also investigated the diurnal response to systemic raclopride, a D2 receptor antagonist. Time of day affected the proportion of LFP oscillations within the 0-3 Hz band and the 3-8 Hz band. In both the striatum and the cerebellum, slow oscillations were strongest at ZT1 and weakest at ZT13. A 3-8 Hz oscillation was present when the slow oscillation was lowest, with peak 3-8 Hz activity occurring at ZT13. Raclopride enhanced the slow oscillations, and had the greatest effect at ZT13. Within the striatum and with the cerebellum, 0-3 Hz coherence was greatest at ZT1, when the slow oscillations were strongest. Coherence was also affected the most by raclopride at ZT13. Our results suggest that neural oscillations in the cerebellum and striatum, and the synchrony between these areas, are modulated by time of day, and that these changes are influenced by dopamine manipulation. This may provide insight into how circadian gene transcription patterns influence network electrophysiology. Future experiments will address how these network alterations are linked with behavior.

PMID: 25309348 [PubMed]