Related Experiment Video
Updated: May 30, 2026
13:07
Simultaneous Intracellular Recording of a Lumbar Motoneuron and the Force Produced by its Motor Unit in the Adult Mouse In vivo
Published on: December 5, 2012
Decorrelation of cortical inputs and motoneuron output
Francesco Negro1, Dario Farina
1Center for Sensory-Motor Interaction, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark.
Journal of Neurophysiology
|July 29, 2011
Summary
Cortical oscillations transmit to spinal motoneurons, but nonlinearity and other inputs affect signal fidelity. Computational models reveal factors influencing this corticospinal pathway
Area of Science:
- Neuroscience
- Computational Neuroscience
- Motor Control
Background:
- The corticospinal tract transmits motor commands from the primary motor cortex to spinal motoneurons.
- This pathway is crucial for modulating force output during voluntary movements.
Purpose of the Study:
- To investigate factors influencing the transmission of cortical input to motoneuron output using a computational model.
- To quantify the impact of motoneuron nonlinearity and additional synaptic inputs on corticospinal signal fidelity.
Main Methods:
- A computational model of a motoneuron population was utilized.
- Coherence analysis was employed to quantify the transmission of oscillations from cortical input to motoneuron output.
- Simulations explored the effects of motoneuron nonlinearity and common synaptic inputs.
Main Results:
- Cortical oscillations are transmitted to the motoneuron pool output at the same frequency, despite motoneuron nonlinearity.
- Motoneuron nonlinearity introduces variability and new spectral lines dependent on input frequencies and discharge rates.
- Common synaptic inputs, independent of the corticospinal drive, reduce coherence between cortical input and motoneuron output.
Conclusions:
- The corticospinal input can be effectively sampled by motoneuron populations.
- Motoneuron nonlinearity and non-corticospinal common synaptic inputs significantly influence the fidelity of corticospinal drive transmission to the motoneuron pool.
Related Concept Videos
01:18Functions of the Nervous System
The nervous system is responsible for coordinating and regulating the body's functions. It functions through three main processes: sensory, integrative, and motor processes. Sensory function involves the detection and transmission of information about internal and external stimuli from sensory receptors to the CNS. The CNS processes this information through an integrative function, where it interprets and makes decisions based on the incoming sensory information. Finally, the motor function...
01:23Propagation of Action Potentials
The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
01:23Somatosensory, Motor, and Association Cortex
The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at the...
01:10Spinal Cord: Information Processing
The spinal cord is an integral hub for motor and sensory information that enables the brain to communicate with the peripheral nervous system (PNS). This communication consists of relaying sensory data and transmission of motor commands.
Sensory Information Processing
Sensory information processing begins at the sensory receptors located in the skin and other tissues, which detect somatic sensory stimuli such as touch, temperature, or pain. These receptors function as catalysts, initiating...
Sensory Information Processing
Sensory information processing begins at the sensory receptors located in the skin and other tissues, which detect somatic sensory stimuli such as touch, temperature, or pain. These receptors function as catalysts, initiating...
01:14Motor and Sensory Areas of the Cortex
The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
01:19The Role of Ion Channels in Neuronal Computation
A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.