Final answer:
The ability of a child to use pronouns like "I" and "you" correctly is linked to an enhanced understanding of other people's perspectives, or 'theory of mind', a cognitive milestone that is foundational for later social skills.
Step-by-step explanation:
Theory of mind is a developmental milestone where children grasp that others have thoughts and feelings distinct from their own. This understanding helps to navigate social nuances and improves empathy, crucial for effective interpersonal interactions. Mastery of personal pronouns aligns with the acknowledgment of oneself as an individual separate from others, which is a key component of theory of mind.
Enhanced use of "I" and "you" signifies a child can distinguish between themselves and the interlocutor, thereby facilitating a deeper comprehension of different perspectives. The development of theory of mind typically starts to emerge around the ages of 3 to 5 years and is a foundation for later social skills, such as cooperation and empathy.