Fig. 1: Savings in a point-to-point visuomotor rotation task.
From: Protection of savings by reducing the salience of opposing errors
a Experiment apparatus. Subjects were seated in a KINARM exoskeleton and executed point-to-point reaching movements to one of four targets. b Perturbation schedule for abrupt adaptation group. This control experiment consisted of 4 experimental periods: (1) 10-cycle baseline period, (2) 40-cycle abrupt 24° rotation (exposure 1), (3) 40-cycle no-visual feedback washout, (4) 40-cycle re-exposure to abrupt 24° rotation (exposure 2). c Learning curves. Solid black line indicates the size of rotation during each period. The reach angle at maximum velocity was calculated on each trial and averaged within each 4-trial cycle. d Savings visualization. Learning curves during the first and second exposure to the rotation are shown. We fit a 2-parameter exponential curve to individual participants to quantify learning rates. The empirical model fit (empirical fit) is also shown overlaid on the measured learning curves (exposure 1 or exposure 2). e Quantification of savings. We compared the learning rate parameters across exposures 1 and 2, quantified via the exponential model fit in (d). Error bars indicated mean ± SE. Single points in (e) represent individual participants. Statistics: ***p < 0.001.
