title: Entropy of space-time outcome in a movement speed-accuracy task.
abstract: The experiment reported was set-up to investigate the space-time entropy of movement outcome as a function of a range of spatial (10, 20 and 30 cm) and temporal (250-2500 ms) criteria in a discrete aiming task. The variability and information entropy of the movement spatial and temporal errors considered separately increased and decreased on the respective dimension as a function of an increment of movement velocity. However, the joint space-time entropy was lowest when the relative contribution of spatial and temporal task criteria was comparable (i.e., mid-range of space-time constraints), and it increased with a greater trade-off between spatial or temporal task demands, revealing a U-shaped function across space-time task criteria. The traditional speed-accuracy functions of spatial error and temporal error considered independently mapped to this joint space-time U-shaped entropy function. The trade-off in movement tasks with joint space-time criteria is between spatial error and timing error, rather than movement speed and accuracy.
authors.affiliation: Department of Kinesiology, The Pennsylvania State University, USA. Electronic address: tuh11@psu.edu.
authors.forename: Tsung-Yu
authors.initials: TY
authors.lastname: Hsieh
authors.affiliation: Department of Kinesiology, The Pennsylvania State University, USA.
authors.forename: Matheus Maia
authors.initials: MM
authors.lastname: Pacheco
authors.affiliation: Department of Kinesiology, The Pennsylvania State University, USA.
authors.forename: Karl M
authors.initials: KM
authors.lastname: Newell
mesh_terms: D000328:Adult; D034201:Computers, Handheld; D019277:Entropy; D005260:Female; D006801:Humans; D008297:Male; D011597:Psychomotor Performance; D011930:Reaction Time; D012984:Software; D013028:Space Perception; D013998:Time Perception; D055815:Young Adult
keywords: Movement entropy; Space–time constraints; Speed–accuracy trade-off