The effect of manipulation of vision and proprioceptive senses in different ages of childhood on the transition time of the relative phase in bimanual coordination task

The purpose of this study was to investigate the effect of manipulation of vision and proprioceptive senses in different ages of childhood on the transition time of the relative phase in bimanual coordination task. 60 children, right-handed, 7-12 aged, with normal vision participated in this study. Participants were seated on adjustable chairs and producing coordination movements with relative phase of 180 degrees and started at 1 Hz frequency that was increased by 0.50 Hz steps in every 5 seconds up to a final movement frequency of 5 Hz. Participants produced the relative phase pattern under different sensory conditions such as with visual and proprioception sense, no vision with proprioception sense, with vision and disorder in biased proprioception. The results revealed that the difference between children was significant in the absence of manipulation of the sense of vision and proprioception. But the interaction between age and vision manipulation wasn't significant in the transition of the relative phase of bimanual coordination. Also, the interaction between ages with proprioception scenes manipulation in the transition of the relative phase of bimanual coordination wasn't significant. .However, manipulation of proprioception scenes and vision scenes without the attention of aged difference were significant. The finding of this study supported the dynamic system based on the self-organization of the system with inducing the velocity parameter that phase transit the out phase to in phase..