Mutual information in the evolution of trajectories in discrete aiming movements.
This study investigated the mutual information in the trajectories of discrete aiming movements on a computer controlled graphics tablet where movement time ( 300 - 2050 ms) was manipulated in a given distance (100 mm) and movement distance (15-240 mm) in 2 given movement times (300 ms and 800 ms ). For the distance-fixed conditions, there was higher mutual information in the slower movements in the 0 vs. 80-100% trajectory point comparisons, whereas the mutual information was higher for the faster movements when comparing within the 80 and 100% points of the movement trajectory. For the time-fixed conditions, the spatial constraints led to a decreasing pattern of the mutual information throughout the points of the trajectory, with the highest mutual information found in the 80 vs. 100% comparison. Overall, the pattern of mutual information reveals systematic modulation of the trajectories between the attractive fixed point of the target as a function of movement condition. These mutual information patterns are postulated to be the consequence of the different relative contributions of feedforward and feedback control processes in trajectory formation as a function of task constraints.
Lai
Shih-Chiung
SC
Department of Physical Education, Taipei Municipal University of Education, No. 1 Aiguo W. Rd., Taipei City, 100, Taiwan. lsc2kpsu@yahoo.com.tw
Mayer-Kress
Gottfried
G
Newell
Karl M
KM
D000328:Adult; D003196:Computer Graphics; D004215:Distance Perception; D019277:Entropy; D005246:Feedback; D006801:Humans; D007257:Information Theory; D008297:Male; D017711:Nonlinear Dynamics; D009949:Orientation; D011597:Psychomotor Performance; D011601:Psychophysics; D011930:Reaction Time