Epley, N., Schroeder, J., & Waytz, A. (2013). Motivated mind perception: Treating pets as people and people as animals. In Gervais, S. (Ed.), Nebraska Symposium on Motivation (Vol. 60, pp 127–152). Springer: New York. [Springer Link]
Short Summary: This paper proposes that anthropomorphism is guided by two primary motives, the need to explain behavior and the need to connect with others.