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Spiking activity along synaptic circuits linking primary somatosensory (S1) and motor (M1) areas is fundamental for sensorimotor integration in cortex. Circuits along the ascending somatosensory pathway through mouse hand/forelimb S1 and M1 were recently described in detail (Yamawaki et al., 2021).

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A brain-tumor neural circuit controls breast cancer progression in mice.

J Clin Invest

December 2023

Experimental Center of Basic Medicine, Chongqing Key Laboratory of Neurobiology, College of Basic Medical Sciences.

Article Synopsis
  • Scientists studied how anxiety from tumors in mice affects their cancer growth!
  • They found that certain brain cells (CRH neurons) get super active when there's a tumor, which makes the mice more anxious!
  • Using special techniques, they showed that reducing this brain activity can help lower both anxiety and tumor growth, and they even found that an antianxiety medicine might help slow down cancer!
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Synaptic alterations and neuronal firing in human epileptic neocortical excitatory networks.

Front Synaptic Neurosci

August 2023

Institute of Cognitive Neuroscience and Psychology, Research Centre for Natural Sciences, Eötvös Loránd Research Network, Budapest, Hungary.

Epilepsy is a prevalent neurological condition, with underlying neuronal mechanisms involving hyperexcitability and hypersynchrony. Imbalance between excitatory and inhibitory circuits, as well as histological reorganization are relatively well-documented in animal models or even in the human hippocampus, but less is known about human neocortical epileptic activity. Our knowledge about changes in the excitatory signaling is especially scarce, compared to that about the inhibitory cell population.

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Mechanosensory cells in the leech share several common features with mechanoreceptors in the human glabrous skin. Previous studies showed that the six T (touch) cells in each body segment of the leech are highly variable in their responses to somatic current injection and change their excitability over time. Here, we investigate three potential reasons for this variability in excitability by comparing the responses of T cells at two soma locations (T2 and T3): (1) Differential effects of time-dependent changes in excitability, (2) divergent synaptic input from the network, and (3) different anatomical structures.

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Upper and lower motor neuron neurophysiology and motor control.

Handb Clin Neurol

August 2023

Faculdade de Medicina-Instituto de Medicina Molecular-Centro de Estudos Egas Moniz, Universidade de Lisboa, Lisbon, Portugal; Department of Neurology, Barts and London School of Medicine, Queen Mary University of London and Royal London Hospital, London, United Kingdom.

This chapter considers the principles that underlie neurophysiological studies of upper motor neuron or lower motor neuron lesions, based on an understanding of the normal structure and function of the motor system. Human motor neurophysiology consists of an evaluation of the active components of the motor system that are relevant to volitional movements. Relatively primitive motor skills include locomotion, much dependent on the spinal cord central pattern generator, reaching, involving proximal and distal muscles activation, and grasping.

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