How does perpetual-motor coupling influence grasping in infants?

What will be an ideal response?

Perceptual-motor coupling is necessary for the infant to coordinate grasping. The perceptual system likely to be used by the infant in coordinating grasping varies with age. Four-month-old infants rely greatly on touch to determine how they will grip an object. They vary their grip on an object depending on its size, shape, and texture, as well as the size of their own hands relative to the object's size. Infants grip small objects with their thumb and forefinger (and sometimes their middle finger too), whereas they grip large objects with all the fingers of one hand or both hands. Eight-month-olds are more likely to use vision as a guide. This developmental change is efficient because vision lets infants preshape their hands as they reach for an object.