Verbal Behavior: Extended Edition. Chapter 16: Special Conditions of Self-Editing. Quote 4

A stimulus may be effective enough to evoke a response although the relationship between the two cannot be identified. When we say He reminds me of so-and-so, but I don’t know why, we are saying essentially When I see him I find myself saying “So-and-so,” but I can’t identify the controlling features of his appearance. (p. 388)