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Optimal sigmoid function models for analysis of transspinal evoked potential recruitment curves recorded from different muscles.
PLoS One
January 2025
Klab4Recovery Research Program, The City University of New York, Staten Island, New York, United States of America.
Recruitment input-output curves of transspinal evoked potentials that represent the net output of spinal neuronal networks during which cortical, spinal and peripheral inputs are integrated as well as motor evoked potentials and H-reflexes are used extensively in research as neurophysiological biomarkers to establish physiological or pathological motor behavior and post-treatment recovery. A comparison between different sigmoidal models to fit the transspinal evoked potentials recruitment curve and estimate the parameters of physiological importance has not been performed. This study sought to address this gap by fitting eight sigmoidal models (Boltzmann, Hill, Log-Logistic, Log-Normal, Weibull-1, Weibull-2, Gompertz, Extreme Value Function) to the transspinal evoked potentials recruitment curves of soleus and tibialis anterior recorded under four different cathodal stimulation settings.
View Article and Find Full Text PDFNeuronal dynamics of cerebellum and medial prefrontal cortex in adaptive motor timing.
Nat Commun
January 2025
Department of Neuroscience, Erasmus MC, Westzeedijk 353, 3015 AA, Rotterdam, the Netherlands.
Precise temporal control of sensorimotor coordination and adaptation is a fundamental basis of animal behavior. How different brain regions are involved in regulating the flexible temporal adaptation remains elusive. Here, we investigated the neuronal dynamics of the cerebellar interposed nucleus (IpN) and the medial prefrontal cortex (mPFC) neurons during temporal adaptation between delay eyeblink conditioning (DEC) and trace eyeblink conditioning (TEC).
View Article and Find Full Text PDFPathophysiology and Management Strategies for Post-Stroke Spasticity: An Update Review.
Int J Mol Sci
January 2025
School of Pharmacy, Hunan University of Chinese Medicine, Changsha 410208, China.
Post-stroke spasticity (PSS), characterized by a velocity-dependent increase in muscle tone and exaggerated reflexes, affects a significant portion of stroke patients and presents a substantial obstacle to post-stroke rehabilitation. Effective management and treatment for PSS remains a significant clinical challenge in the interdisciplinary aspect depending on the understanding of its etiologies and pathophysiology. We systematically review the relevant literature and provide the main pathogenic hypotheses: alterations in the balance of excitatory and inhibitory inputs to the descending pathway or the spinal circuit, which are secondary to cortical and subcortical ischemic or hemorrhagic injury, lead to disinhibition of the stretch reflex and increased muscle tone.
View Article and Find Full Text PDFEffects of Metabolic Dysfunction-Associated Steatohepatitis in Alertness, Associative Learning, and Astrocyte Density.
Brain Behav
January 2025
INEUROPA, Instituto de Neurociencias del Principado de Asturias, Oviedo, Spain.
Purpose: Metabolic dysfunction-associated steatohepatitis (MASH) is a prevalent disease caused by high fat and high cholesterol intake, which leads to systemic deterioration. The aim of this research is to conduct a psychobiological exploration of MASH in adult male rats.
Methods: Subjects who were administered a high-fat and high-cholesterol diet for 14 weeks.
Spinally targeted paired associated stimulation with high-frequency peripheral component induces spinal level plasticity in healthy subjects.
Sci Rep
December 2024
BioMag Laboratory, HUS Diagnostic Center, Helsinki University Hospital, University of Helsinki and Aalto University School of Science, Helsinki, Finland.
Article Synopsis
- A new technique called high-PAS combines high-frequency peripheral nerve stimulation (PNS) and high-intensity transcranial magnetic stimulation (TMS) to potentially enhance motor function in patients with incomplete spinal cord injuries.
- The interstimulus interval (ISI) in high-PAS allows for flexibility, making it easier to implement in clinical settings where precise timing is tough, but this also creates challenges for measuring its effectiveness.
- Research with ten healthy participants showed that high-PAS improved motor-evoked potentials (MEPs) and significantly increased spinal excitability (measured by H-reflex amplitudes) during spinal-targeted sessions, but not in cortical-targeted sessions.
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