Fig. 3.

Paired difference in performance thresholds by DBS status, expressed as percentage of inter-onset-interval for tasks Var, Isoc and Met, and percentage jitter for Pul. The first and third measures within each triplet show performance for each run with DBS ‘on’ (run 1&3) compared to that with DBS ‘off’ (run 2); values greater than zero denote a deterioration in performance with DBS ‘on’ compared to ‘off’, while those less than zero denote an improvement in performance in ‘on’ compared to ‘off’. The middle measure shows the difference in performance between the two runs with DBS ‘on’. Error bars denote confidence interval, and symbols the group mean.