Accuracy of visual estimation of the rigidity of a bouncing object T Yoshizawa, T Yamada, T Kawahara |
|---|
Human Information System Laboratory, Kanazawa Institute of Technology, Japan
|
| A locus of a moving object is a powerful cue for an estimation of the object rigidity when it bounces. Our aim of this study is to clarify how accurate our visual estimation of the object rigidity is. We presented successive animations that a circular object (0.194-degree diameter) with a coefficient of restitution bounced at a rigid floor after a drop of 15.5 degrees; observers (five undergraduates who consented to the experiments) judged which of the animations (either was the reference) included an object appearing to be more rigid. We measured thresholds of the coefficient of restitution at which the observers could detect difference between rigidities of a standard object and a test object by the staircase method. We tested at coefficients of restitution of 0.125, 0.25, 0.5, and 1.0. Accuracies of the rigidity were quite higher (more than 90 % relative to the reference’s coefficient) regardless of the coefficient of restitution for most observers, and decreased with the coefficient, significantly. These results derived from ANOVA suggest that it is easier to estimate the rigidity of a harder object explicitly, than that of a softer object. |
| Up Home |
|---|