Figure 6.

Effect of burst dynamics before movement onset on peak velocity (PV) in Condition 4. Bursting dynamics were studied over the period from −2.5 s to movement onset in the Condition 4 (go-cues not time-locked to bursts). A, Compares two groups (median split) according to whether the amplitude peak of the last burst before movement onset was close to the movement onset (0.29 ± 0.021 s) or further from the movement onset (0.88 ± 0.03 s). No significant difference was found between the two groups (n = 15, z = 53, p = 0.72). B, Compares the trials median split into those with lower (0.84 ± 0.054 bursts/s) and higher rate of bursting (2.09 ± 0.051 bursts/s) before movement onset. Trials with a higher burst rate before movement slowed down more (n = 15, z = 112, p = 0.002). Similar results were reproduced for other time windows (−3 s to movement onset and −2.5 s to movement onset; see main text). C, Compares the effect of interval between bursts before movement onset. Trials are median split into those with shorter (0.41 ± 0.01 s) and longer (0.76 ± 0.02 s) intervals between burst peaks before movement onset. Note, only trials with at least two bursts in the pre-movement period have been included. Trials with bursts occurring at short intervals before movement onset slowed down more (n = 15, z = 10, p = 0.003). Red crosses correspond to value above the 75th or below the 25th percentile. **p < 0.01. n.s. = not significant.