Figure 3.
Low-D representations of recorded neural data and correlations of single-trial RT predictions with RT. GPFA reductions of neural data recorded for three randomly selected (A) and for all 49 (B) preparations and movement initiations to the same target (G20040123, target 13, which is at a distance of 100mm and angle 45°). Same color code is used here as in the previous figure. The neural state at the time of target onset are bold red dots; at the time of the go cue are bold green dots; at the time of measured movement onset are bold blue dots. Lighter dots are separated by 20ms. (C) Normalized path neural speed in GPFA space as a function of time relative to target onset. Same color code used here as in previous figures. Dark black trace is the mean speed across all trials. Note that this speed increases after target onset and decreases to near zero until the go cue (green portion of traces). (D) Histograms of correlations coefficients of neural metric described in Fig. 1C with Δt = 100ms across all reach targets performed by two monkeys (G and H). The medians of both distributions (marked with arrows) are not 0 with p<0.01 (Wilcoxon sign-rank test). Colored bars represent those correlations that are statistically significant (p<0.05).