Margaret Floy Washburn (1871-1939) Image from http://asweb.artsci.uc.edu/psychology/department/history.html

"[A]ll psychic interpretation of animal behavior must be on the analogy of human experience...Our acquiantance with the mind of animals rests upon the same basis as our acquiantance with the mind of our fellow-man; both are derived from observed behavior. The actions of our feloow-man resemble our own, and we therefore infer in them like subjective states to ours: the actions of animals represent ours less completely, but the difference is one of degree, not of kind...the facts are those of hiuman and animal behavior; but the mental processes are as justifiable as any others with which science deals" (Washburn as quoted by Wozniak, 1999).