APA 3120 Lecture 4: Lecture 4_ Movement Principles
29 Jan 2019
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Closed loop: information can be feedback to make movements. First a big movement than a sub movement. Bring you within the area of the target. Once you have external info to make the. Target then you use closed loop processes to reach the target. Utilize feedback (need sufficient time) (1) feedback-based movements. How fast movement is performed compared to how accurate. Control distance and size of target (independent variable) Stylus is tapped between 2 targets (w width and distance a) a= mt, when id =0 (target overlap a=0. 5, w=1) b= added mt caused by increasing the id of one unit. Start at home position and tap between the two. Relationship between speed and average movement time. B is the slope, how difficult the task progresses. Bits are needed to solve uncertainty of n alternatives. Id= log2(2a/w) (how hard a certain combination of a and w is) Log2(2a/w)= information needed to solve uncertainty (how much info to process)
