An error-tuned model for sensorimotor learning
Fig 5
Experiment 4: Opposing versus orthogonal dynamics.
A. The paradigm consisted of the first five blocks alternating between exposure at 180° and exposure at either 0° or 270° (opposing or orthogonal conditions; here shown as 270°). Interference was assessed by comparing PD on the 3rd and 5th block (purple comparison). The sixth block was either exposure (E6) or zero-force (Z6). Facilitation was assessed by comparing PD on the 7th block (Z180°) between E6 and Z6 conditions (dark green comparison). B. The trial-series for the four conditions (grey shading shows ±SE across subjects). Rows are opposing versus orthogonal dynamics and columns are E6 (exposure trials on 6th block) or Z6 (zero-force trials on 6th block). The model fits are shown in all panels for the CDM (blue) and ETM (red). Purple and dark green arrows test for interference and facilitation, respectively. C. Interference for the opposing and orthogonal conditions for the experimental data (black; error-bars show SE across subjects; p-values are for two-tailed paired t-tests) and the two models (CDM in blue; ETM in red). D. Facilitation, plotted as in panel C.