When performing or learning skilled behaviour such as coordinated rhythmic movement’s perception and action go hand in hand. However to understand which of these is limiting performance the isolation of either perception or action is required. To achieve this Wilson, Snapp-Childs and Bingham (2010) used two- alternative forced choice judgements (2AFC) and coordinated rhythmic movement performance during their study.
Assessments were performed at baseline and post training. They involved judgement at 90° and 180° and movement at 0° 90° 180°. Further retention tests were performed a week after post training in which just the movement trials were performed. However to assess the role of perception no movement trials were performed during training. Therefore improved movement performance would be due to improved perception. The training consisted of judgement at 90° with up to 14 training sessions or to the point when performance plateaued. A control group did the assessment but no training.
Judgement assessments involved 2AFC at 90° and 180° with no feedback. This consisted of a pair of 2 moving dots with 1 of the pair moving at the target relative phase whilst the other was moving at the same or a different phase. Different phases were +/- 9°, 18°, 27°, 36°, 45°, producing 21 different trial types in randomised order. An additional 1 example assessment was given at the start of the trial
Judgement training was performed at 90°. There was 12 blocks of 2AFC 90° trials per training session. Each block compared 90° to 4 other phases 2 less than and 2 greater than 90°. Trial 1 and 4 were 90° +/- 40° reducing by 10° between each set. Trial 2 and 3 were 90° +/- 20° reducing by 5° between each set. Each of the 4 trials appeared in random order in each block. Feedback was given following judgements. When subjects achieved 85% correct they progressed to the next discrimination set. Maximum of 4 training sessions per set with a maximum 6 received on the last set.
Wilson, A. D., W. Snapp-Childs., & G. P. Bingham. (2010), Perceptual Learning Immediately Yields New Stable Motor Coordination. Journal of Experimental Psychology: Human Perception and Performance. 36(6), 1508-1514.