Supplementary Figure 3: jPCA projections of the population responses for monkey N and the regularized model for monkey N.
From: A neural network that finds a naturalistic solution for the production of muscle activity
(A) jPCA projections of the neural population response for monkey N. Each trace shows the evolution of the neural state over 500ms. Traces start -180ms before movement onset; at the moment the relatively stable preparatory state (circles) transitioned to the movement period trajectory (same conventions as Figure 3). The three projections correspond to the largest magnitude complex eigenvalue pairs of the matrix Mskew, found when fitting the data with ẋ = Mskewx (Experimental Procedures). These eigenvalues correspond to frequencies of 2.6Hz, 1.6Hz, and 1.2Hz (left to right) with a quality of fit (R2) for the optimal purely oscillatory linear system of 0.77.
(B) jPCA projections for the regularized model of monkey N. Same conventions as in panel A. Frequencies are 2.2Hz, 1.3Hz, and 0.8 Hz. The linear system, ẋ = Mskewx P has a quality of fit (R2) of 0.79.
