The primary aim of this experiment was to find out if reducing the amount of lissajous feedback would allow participants to develop an internal representation of the coordinated pattern, enabling them to effectively perform bimanual coordination tasks without any feedback.
Participants were randomly assigned to one of nine groups that differed in terms of the percent of time they received Lissajous feedback (100%, 50% or 0%). For the 50% feedback group Lissajous feedback was presented in a fading schedule (25–25–20–20– 15–15–10–10–5–5 s) for each consecutive trial. The feedback was provided at the beginning of each trial and withdrawn according to the schedule above.
Apriori comparisons indicated that after 5 minutes of practice, participants who received 50% feedback had considerably higher RMSE values on the no-Lissajous test compared with participants who received 100% feedback, t(12)=4.63, pb.05, on the Lissajous test. After 20 minutes of practice, participants who received 50% feedback performed just as well as the group who had received 100% feedback in a test with no Lissajous feedback.
More practice while receiving 100% Lissajous feedback did not help participants to develop an internal representation of the task or improve their ability to perform when the Lissajous feedback was present. On practice trials while receiving 50% Lissajous feedback participants seek out and process other sources of information necessary to perform the task. This could result in participants acquiring the capability to detect and correct errors. The result is improved performance on tests without extrinsic feedback.