Abstract
This study redefined variability of rolling-over movements among adults in relation to developmental research on rolling-over movements in infancy. Based on the concept of multiple time scales, we experimentally analyzed the microgenetic processes of 26 healthy male adults’ rolling-over movements in terms of individual intrinsic dynamics. In Set 1, participants rolled over comfortably. In Sets 2-4, they rolled over in three different movement patterns. In Set 5, participants again rolled over comfortably. Our results demonstrated the following: (a) correlations of performances in Sets 2-4 with that in Set 1 differed according to the instructed movement patterns; and (b) changes in performances of Sets 1 and 5 differed by participant. These results led to two conclusions: (a) motor coordination with individual intrinsic dynamics differed by restrictions on movement, and (b) stability of intrinsic dynamics differed by participant. Finally, the present results were integrated with previous findings to outline the developmental process of rolling-over movements.
