title: Optimal control strategies under different feedback schedules: kinematic evidence.
abstract: Two experiments were conducted in which participants (N = 12, Experiment 1; N = 12, Experiment 2) performed rapid aiming movements with and without visual feedback under blocked, random, and alternating feedback schedules. Prior knowledge of whether vision would be available had a significant impact on the strategies that participants adopted. When they knew that vision would be available, less time was spent preparing movements before movement initiation. Participants also reached peak deceleration sooner but spent more time after peak deceleration adjusting limb trajectories. Consistent with those findings, analysis of spatial variability at different points in the trajectory indicated that variability increased up to peak deceleration but then decreased from peak deceleration to the end of the movement.
authors.affiliation: School of Sport, Health, and Exercise Sciences, University of Wales, Bangor, Gwynedd, Wales LL57 2PX, UK. m.khan@bangor.ac.uk
authors.forename: Michael A
authors.initials: MA
authors.lastname: Khan
authors.forename: Digby
authors.initials: D
authors.lastname: Elliot
authors.forename: Jamie
authors.initials: J
authors.lastname: Coull
authors.forename: Romeo
authors.initials: R
authors.lastname: Chua
authors.forename: James
authors.initials: J
authors.lastname: Lyons
mesh_terms: D001696:Biomechanical Phenomena; D005246:Feedback; D005260:Female; D006801:Humans; D008297:Male; D009068:Movement / Q000502:physiology