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1 Physiology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA; Institute for Neuroscience, Northwestern University, Chicago, IL, USA
* To whom correspondence should be addressed. E-mail: lm{at}northwestern.edu.
We have adopted an analysis which produces a post hoc prediction of the time course of EMG activity from the discharge of ensembles of neurons recorded sequentially from the primary motor cortex (M1) of a monkey. Over several recording sessions, we collected data from 50 M1 neurons and several distal forelimb muscles during a stereotyped precision grip task. Ensemble averages were constructed from 5-10 trials for each neuron and EMG signal. We used multiple linear regression on randomly chosen subsets of these neurons to find the best fit between the neuronal and EMG data. The fixed delay between neuronal and EMG signals which yielded the largest coefficient of determination (R2) between predicted and actual EMG was 50 ms. R2 averaged 0.83 for ensembles composed of 15 neurons. If instead, each neuronal signal was delayed by the time of its peak cross-correlation with the EMG signal, R2 increased to 0.88. Using all 50 neurons, R2 under these conditions averaged nearly 0.97. A similar analysis was done with signals recorded during both a power grip and a precision grip task. Quality of the fit dropped dramatically when parameters from the precision grip for a given set of neurons were used to fit data recorded during the power grip. However, when a single set of regression parameters was used to fit a combination of the two tasks, the quality of the fits decreased by less than 10% from that of a single task.
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