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Transcranial magnetic stimulation of primary motor cortex elicits an immediate transcranial evoked potential.
Brain Stimul
August 2024
Danish Research Centre for Magnetic Resonance, Centre for Functional and Diagnostic Imaging and Research, Copenhagen University Hospital - Amager and Hvidovre, Copenhagen, Denmark. Electronic address:
Background: Transcranial evoked potentials (TEPs) measured via electroencephalography (EEG) are widely used to study the cortical responses to transcranial magnetic stimulation (TMS). Immediate transcranial evoked potentials (i-TEPs) have been obscured by pulse and muscular artifacts. Thus, the TEP peaks that are commonly reported have latencies that are too long to be caused by direct excitation of cortical neurons.
View Article and Find Full Text PDFLong-term Recordings of Arcuate Nucleus Kisspeptin Neurons Across the Mouse Estrous Cycle.
Endocrinology
January 2024
Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2 3EG, UK.
The arcuate nucleus kisspeptin (ARNKISS) neurons represent the GnRH pulse generator that likely drives pulsatile gonadotropin secretion in all mammals. Using an improved GCaMP fiber photometry system enabling long-term continuous recordings, we aimed to establish a definitive profile of ARNKISS neuronal activity across the murine estrous cycle. As noted previously, a substantial reduction in the frequency of ARNKISS neuron synchronization events (SEs) occurs on late proestrus and extends into estrus.
View Article and Find Full Text PDFModified mouse model of repeated mild traumatic brain injury through a thinned-skull window and fluid percussion.
J Neurosci Res
October 2023
College of Physical Education and Health Sciences, Zhejiang Normal University, Jinhua, China.
Mild traumatic brain injury (mTBI) is a clinically highly heterogeneous neurological disorder, none of the existing animal models can replicate the entire sequelae. This study aimed to develop a modified closed head injury (CHI) model of repeated mTBI (rmTBI) for investigating Ca fluctuations of the affected neural network, the alternations of electrophysiology, and behavioral dysfunctions. The transcranial Ca study protocol includes AAV-GCaMP6s infection in the right motor cortex, thinned-skull preparation, and two-photon laser scanning microscopy (TPLSM) imaging.
View Article and Find Full Text PDFResponse of sleep slow oscillations to acoustic stimulation is evidenced by distinctive synchronization processes.
Sleep
June 2023
Department of Biomedical Engineering, University of Los Andes, Bogotá, Colombia.
Closed-loop acoustic stimulation (CLAS) during sleep has shown to boost slow wave (SW) amplitude and spindle power. Moreover, sleep SW have been classified based on different processes of neuronal synchronization. Thus, different types of SW events may have distinct functional roles and be differentially affected by external stimuli.
View Article and Find Full Text PDFMediation of Sinusoidal Network Oscillations in the Locus Coeruleus of Newborn Rat Slices by Pharmacologically Distinct AMPA and KA Receptors.
Brain Sci
July 2022
Department of Physiology, Faculty of Medicine & Dentistry, 750 MSB, University of Alberta, Edmonton, AB T6G 2H7, Canada.
Brain control by locus coeruleus (LC) neurons involves afferent glutamate (Glu) inputs. In newborns, LC Glu receptors and responses may be sparse due to immaturity of the brain circuits providing such input. However, we reported, using newborn rat brain slices, that Glu and its ionotropic receptor (iGluR) agonist NMDA transform spontaneous local field potential (LFP) rhythm.
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