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Perceiving Affordances for Gap Crossing: Accuracy, Predictors, and Age Effect
Purpose: Direct perception perspective of ecological approach was used to investigate the coupling of individuals' perception and action, and to find out the different predictors of judging and actual crossing in different age groups. Methods: Twenty-one children, eighteen adults and nineteen old people joined in this experiment. The body height, eye-height, leg length, leg strength, and the range of motion in hip were measured before the judged and actual gap crossing test. The length of gap was 50-130 cm. A3 (age)�2 (crossing) mixed design two-way ANOVA was used to examine the relationship between age groups and crossing tests, and a stepwise regression was used to test the correlation between crossing and individual factors. Results: (1) There is a significant difference between judged and actual crossing in children and old people than adults, and (2) The range of motion in hip is positively correlated to actual crossing in these three groups. The eye height and leg length were also positively correlated to old peoples' judged gap crossing; the perceptual result and the leg strength were also positively correlated to actual gap crossing. Conclusions: (1) Children and old people have lower perception-action coupling ability than adults, and (2) The range of motion in hip can be the predictor of actual crossing in each age group. The eye height, leg length and range of motion in hip can also be the predictors of judged crossing for old people. Judged crossing result and leg strength were the predictors of actual crossing in old people.
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