Question

Between 9 and 12 months of age, refinement occurs in the ability to use thumb and finger pad control for tiny and small objects.

1) More precise preparation of the fingers before initiation of grasp
2) more inhibition of the ulnar fingers
3) and slight wrist extension
4) forearm supination are characteristics of this refinement.

Answer 1

Between 9 and 12 months of age, infants refine their ability to use thumb and finger pad control for small objects, characterized by more precise finger preparation, inhibition of the ulnar fingers, slight wrist extension, and forearm supination.

Step-by-step explanation:

Between 9 and 12 months of age, infants undergo refinement in their ability to use thumb and finger pad control for small objects. This refinement is characterized by:

1. More precise preparation of the fingers before initiating a grasp.
2. Inhibition of the ulnar fingers, meaning less involvement of the little finger and ring finger in the grasp.
3. Slight wrist extension to facilitate a stable holding position.
4. Forearm supination, or the rotation of the forearm to place the palm upwards, which aids in better grip and control.

This refinement in fine motor skills allows infants to manipulate objects with more precision and control.