Final answer:
A child's difficulty initiating a ball-throwing game, despite capable physical skills, is indicative of a problem with ideation which affects motor planning and is key to psychosocial development during preschool years.
Step-by-step explanation:
A child who struggles with initiating a game of back and forth ball throwing despite having the necessary physical capacity is likely having trouble with ideation. Ideation is a part of motor planning, which involves coming up with an idea for a new motor activity. When considering the context of the psychosocial development in preschoolers, ideation issues can be a sign of difficulty in planning and achieving goals within social play, as well as asserting control over their environment. In such cases, children may show a lack of confidence and feel a sense of purposelessness, aligned with Erikson's task of initiative versus guilt. The ability to initiate activities is crucial for cognitive and psychosocial development in children, along with the development of motor skills and coordination, which can be observed through various physical activities such as throwing a ball or drawing.