PCA results. Variance captured by the first mode for acceleration (grey markers) and deceleration (black markers) movement phases in both age groups. Error bars represent one standard deviation from the mean. The same pattern can be observed for both groups: movement trajectory presented a low and stable variability throughout the difficulty range in the acceleration phase, however, fluctuations progressively increased in the deceleration phase (starting 5.5 bits in young and 6 bits in elderly participants).
Sleimen-Malkoun et al. BMC Neuroscience 2013 14:145 doi:10.1186/1471-2202-14-145