["The Journal of Physiology, EarlyView. ", "\nAbstract figure legend A schematic overview of the proposed motor neuron drive framework. Unlike the traditionally assumed continuous common input (cCI), we propose that impulsive common inputs (iCI) constitute a key driver of motor neuron (MN) pool activity. This framework is validated through biophysically realistic computational simulations and experimental recordings from tibialis anterior (surface EMG) and flexor carpi radialis (intramuscular EMG) during isometric contractions. The results show that iCI can explain key features of the experimental recordings, such as the presence of sporadic events of synchronization. We also show that iCI drive the MN pool towards a non‐linear behaviour, and its presence distorts the transmission of cCI. These results constitute a paradigm shift in the current understanding of motor control, by indicating the existence of different inputs than the traditionally assumed. \n\n\n\n\n\n\n\n\n\nAbstract\nSpinal motor neurons serve as the link between the nervous system and muscles. As the final common pathway of the neuromuscular system, they receive inputs from both higher‐level controllers and afferent pathways. It is often assumed that spinal motor neurons are primarily driven by continuous common inputs (cCI) within different frequency bands. Within this framework, the motor neuron pool behaves as a linear amplifier of the cCI. This implies that the frequency content of descending and spinal oscillatory signals is preserved and faithfully transmitted to the muscles; thus, the spectral content at the output of the motor neuron pool corresponds to that of the cCI. However, this framework overlooks the possibility that motor neurons could also be driven by impulsive common inputs (iCI), which can induce synchronization among them and disrupt the linear transmission of other synaptic inputs at the pool level. To test this hypothesis, computational simulations and experimental data from two different human muscles were used to characterize different aspects related to motor neuron spiking synchronization at the pool level. Our findings suggest that, indeed, iCI can account for relevant features observed in experimental data such as the presence of synchronization events at the pool level. We also observed that such impulsive inputs can affect the linearity in the transmission of cCI by the motor neuron pool. This study represents pioneering indirect evidence of the existence of iCI as inputs to motor neurons.\n\n\n\n\n\n\n\n\n\nKey points\n\nThe current understanding of the motor control of voluntary movements assumes a continuous control, driven by oscillatory common signals.\nSome aspects of motor unit pool behaviour (particularly in terms of spiking synchronization and spectral content) typically observed in experimental recordings cannot be reproduced in simulations that only use continuous common inputs (cCI) to motor neurons.\nThis study provides evidence indicating that spinal motor neurons receive a portion of their synaptic input in the form of impulsive common inputs (iCI) that synchronize their activity.\nThe study also shows how such iCI can affect the linear transmission of other cCI by the motor neuron pool.\nThese findings constitute a fundamental paradigm shift in the understanding of motor control and impact the development of interfaces that extract information from the activity of spinal motor neurons.\n\n\n"]