The volitional control of individual motor units is constrained within low-dimensional neural manifolds by common inputs

This repository contains all the raw electromyographic (EMG) data and the edited motor unit spike trains. These data are associated with the following article submitted to Journal of Neuroscience:
The volitional control of individual motor units is constrained within low-dimensional neural manifolds by common inputs.
The preprint can be found at: https://www.biorxiv.org/content/10.1101/2024.01.05.573816v1
Contact: Julien Rossato ([e-mail]), Simon Avrillon ([e-mail]) or François Hug ([e-mail])
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[muscle group]_[Participant]/[condition].mat

List of "muscle group": gastrocnemii (triceps surae experiment), vastii (quadriceps experiment)
List of "Participant": P#1 to P#10 for the triceps surae experiment, and P#1 to P#5 for the quadriceps experiment
List of “condition”: MVC (maximal voluntary contraction), Training_baseline (reference contractions [torque feedback]), Online_MU_trial (online contractions [motor unit + torque feedback])
These files can be opened with Matlab (Mathworks) and with our open-source software for decompositing and editing motor units (https://github.com/simonavrillon/MUedit)
Below are the decription of the main variables used in the article mentioned avove:
signal.fsamp: sampling ratesignal.nChan: number of recroded channels (we used EMG grids of 64 electrodes)signal.data: raw EMG signalssignal.muscle: name of the recorded musclessignal.EMGmask: excluded EMG channels due to noise or artefactssignal.path: effective torquesignal.path3D: data from the 3D force gauge (only for triceps surae experiment)signal.feedneuro: target to be reached (for online control tasks) in each of the 10 contractions. For more information about the targets, please refer to the article.parameters.MUID: ID of the decomposed motor units (GL, gastrocnemius lateralis; GM, gastrocnemius medialis; VL, vastus lateralis; VM vastus medialis)edition.Dischargetimes: discharge times for each identified motor units (after manual editing).edition.Pulsetrain. Pulse train for each identified motor unitsPlease note: Although we recorded data from the vastus lateralis and tibialis anterior muscles during the triceps surae experiments, we did not run the decomposition algorithm on these data.

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MU_pairs.mat
This file contains information about the pairs of motor units, which have been tested during the online tasks.
ID: ID of the participant where GM stands for triceps surae experiment and VL stands for quadriceps experimentMUID1: first motor unit of the pair being considered (it corresponds to parameters.MUID in the other files)MUID2: second motor unit of the pair being considered targetMU: target to be reached in each of the 10 contractions. For more information about the targets, please refer to the article.