Abstract
Studies of bimanual coordination have found that only two stable relative phases (0° and 180°) are produced when a participant rhythmically moves two joints in different limbs at the same frequency. Increasing the frequency of oscillation causes an increase in relative phase variability in both of these phase modes. However, relative phasing at 180° is more variable than relative phasing at 0°, and when the frequency of oscillation reaches a critical frequency, a transition to 0° occurs. These results have been replicated when 2 people have coordinated their respective limb movements using vision. This inspired us to investigate the visual perception of relative phase. In Experiment 1, recordings of human interlimb oscillations exhibiting different frequencies, mean relative phases, and different amounts of phase variability were used to generate computer displays of spheres oscillating either side to side in a frontoparallel plane or in depth. Participants judged the stability of relative phase. Judgments covaried with phase variability only when the mean phase was 0° or 180°. Otherwise, judgments covaried with mean relative phase, even after extensive instruction and demonstration. In Experiment 2, mean relative phase and phase variability were manipulated independently via simulations, and participants were trained to perceive phase variability in testing sessions in which mean phase was held constant. The results of Experiment 1 were replicated. The HKB model was fitted to mean judgment standard deviations.
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Bingham, G.P., Schmidt, R.C. & Zaal, F.T.J.M. Visual perception of the relative phasing of human limb movements. Perception & Psychophysics 61, 246–258 (1999). https://doi.org/10.3758/BF03206886
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DOI: https://doi.org/10.3758/BF03206886