Abstract

Rationality has long been held to be the hallmark of what it means to be human. Consequently, the act of deductive inference—a central element of human reasoning—may be assumed to be natural. Not surprisingly, the study of formal logic has traditionally been regarded as essential for the philosophy major and recommended for many others. Yet both empirical study and pedagogical experience suggest that we deduce, on the whole, rather poorly. In fact, reasoning within formal systems seems to pose insurmountable difficulties for some students. In this article, I suggest that both classroom experience and psychological research point to the possibility of a logic-related learning disability which I refer to as inference blindness. I further suggest that the dual-mechanism theory proposed by Vinod Goel offers the best way of understanding deductive reasoning and that the application of this theory suggests a preliminary hypothesis regarding inference blindness.