Figure 5.

Encoding of poke context (sample, delay, or choice poke) accounts for the large majority of explainable firing rate variability in all three regions. A, The coefficient of partial determination (CPD) from a general linear model was used to find the fraction of total firing rate variance around pokes that can be explained by the poke context. The CPD is highest in the MOs pseudopopulation. Double-colored straight lines represent statistically significant differences (p-value < .05) between the two respective subregions in that time bin, after correcting for both false discovery rate and family-wise error rate. B, CPD was also calculated for the sample port, choice port and outcome (correct vs incorrect trials) variables. When combined with these other three predictor variables, poke context variability accounts for over 75% of explainable firing rate variance in all regions. C, Poke context is decodable with nearly 100% accuracy in all regions using a linear support vector machine (SVM). Chance level decoding in the shuffled control (dashed lines) is 33%.