The development of motor skills occurs once the neural machinery necessary for its development is established. The motor skills are developed through different stages, which is influenced by the epigenetic factors. The interacting changes in brain and behaviour especially with respective to the development of motor skills, logical thinking and language can be clearly observed in infants and children.
The last stage in motor development is characterized by the independent movement of fingers or the pincer grasp. This typically occurs at an age of 8 to 12 months of age.
Thus, the blank can be filled with pincer grasp or independent movement of fingers.