Fig. 5.
Dynamic range of neural tuning and mean firing rate do not change with long-term practice. A: dynamic range of tuning before and after learning for all tracked neurons. Each point represents the dynamic tuning range fit from the first 40 trials to each target on the first and last days of the perturbation session. Data are combined for both monkeys. The unity line is shown as a reference. B: comparison of the distributions of changes in dynamic tuning range between the 3 groups of neurons. To account for the wide range of dynamic tuning across neurons, changes in dynamic range of tuning were normalized as (DRafter − DRbefore)/DRbefore. Horizontal lines within boxes represent the medians. Upper and lower boundaries of boxes represent the 75% and 25% quantiles of the data, respectively. Upper and lower whiskers represent the 95% and 5% quantiles in a normal distribution fitted on the data, respectively. C and D: same as A and B, but with the average number of spikes emitted by each neuron during every trial before and after learning. Spike counts were taken in a 200-ms window centered at the point when the cursor was halfway from the center to the target. n.s., Not significant.