Figure 8. Dimensionally reduced representation of neural activity across multiple context changes.

(A) Demixed PCA (dPCA) components for an example session with Monkey N performing normal trials (black), wrist trials (yellow), spring trials (blue), and rubber band trials (green). Solid traces are flexion trials, and dashed traces are extension trials. Components are organized by which behavioral parameter they explain the most neural variance for. Component numbers are ordered by how much neural variance they account for and the percent in brackets is the neural variance accounted for. (B) Percent of neural variance accounted for by each behavioral parameter. Bars with solid edges are for Monkey N, and bars with dashed edges are for Monkey W. Error bars indicate standard deviation across sessions. Three sessions are included for Monkey N, and two sessions are included for Monkey W. (C) Average muscle activation around peak movement for flexor muscles (top) or extensor muscles (bottom) during trials for each context and target plotted against the average activation of the first context-dependent dPCA component during the same trials. Each point represents the average activations in a series of trials in one context toward one target. Markers indicate which session the sample is from. Correlations are calculated within samples for one target, either flexion (red) or extension (black).