为了更好地理解RAD，首先需要理解附件;因此，依恋理论在这里得到了检验。在他早期的作品中，John Bowlby指出，“依恋是一种深刻而持久的情感纽带，它将一个人与另一个人跨越时间和空间联系在一起;人类之间持久的心理联系“依恋在幼儿的具体行动中被注意到，例如在痛苦、脆弱或处于危险时寻求与他们的照顾者保持亲密关系(Bretherton, 1992)。照顾者的依恋促进行为是涉及到对孩子的身体和情感需求做出微妙而恰当的反应的行为(Reebye, 2007)。依恋理论阐明了父母和孩子之间的关系是如何产生和影响孩子未来的发展的。今天的RAD概念的理论框架是在依恋理论中发现的。在20世纪30年代担任精神病医生期间，Bowlby治疗情绪障碍儿童(Bretherton, 1992)。这项研究让Bowlby检验了孩子与母亲关系的重要性，特别是在认知、社交和情感发展方面(Solomon et al.， 2017)。这项工作形成了Bowlby对早期与孩子母亲的分离和后来的适应问题之间联系的理解(Bretherton, 1992)。这使得鲍尔比开始创立他的依恋理论。
To better understand RAD, it is first necessary to understand attachment; therefore, attachment theory is examined here. In his early works, John Bowlby stated, “attachment is a deep and enduring emotional bond that connects one person to another across time and space; a lasting psychological connectedness between human beings” Attachment is noted in the specific actions of young children, such as looking to remain close to their caregiver when distressed, when vulnerable, or in danger (Bretherton, 1992). Attachment promoting behaviors for caregivers are behaviors involving the delicate and proper response to the child’s physical and emotional requirements (Reebye, 2007). Attachment theory clarifies how the relationship between parent and child emanates and effects the child’s future development .The theoretical framework for today’s notion of RAD is found in attachment theory, which originates from work undertaken by Bowlby and others from the 1930s through the 1980s. While working as a psychiatrist in the 1930s Bowlby treated emotionally impaired children (Bretherton, 1992). This work led Bowlby to examine the importance of the child’s relationship with their mother, specifically as pertains to their cognitive, social and emotional development (Solomon et al., 2017). This work shaped Bowlby’s understanding of the connection between early separations from the child’s mother and later adjustment problems (Bretherton, 1992). This led Bowlby to begin to forge his theory of attachment.