Final answer:
Separation Anxiety Disorder in children is primarily related to the fear of being away from familiar people or places, likely emerging as object permanence develops and influenced by attachment styles.
Step-by-step explanation:
Separation Anxiety Disorder (SAD) in children is primarily related to a fear of being away from familiar people or places. It is a condition where a child experiences extreme anxiety when separated from home or from people to whom the child has a strong emotional attachment, such as their parents. According to developmental theories, such as those proposed by Piaget, this type of fear typically begins to become noticeable around the time children develop object permanence and begin to exhibit stranger anxiety. SAD can manifest in various ways, such as extreme distress when anticipating or experiencing separation, and is influenced by attachment styles developed through interactions with caregivers. Securely attached children express distress on separation but feel comforted upon the return of the caregiver, whereas children with resistant attachment show clingy behavior but resist comforting efforts, which can exacerbate feelings of anxiety.