Categories knowable by sight alone differ from those needing speech too.

Evidence

Categoric knowing may be said to be simple, when it is based exclusively on information that can be obtained visually. Thus, in the United States, information about the age and sex of another usually requires no more than visual apprehension. Categoric knowing may be said to be complex when it is based on information that is obtained both visually and verbally. Thus, merely seeing a young man on the street will not be sufficient for determining that he is a father. To know that, one would have to be told, either by the person himself or by another. — Lyn H. Lofland, World of Strangers_ Order and Action in…, 98

Categorization

• DEFINE: Introduces the simple (visual-only) versus complex (visual plus verbal) distinction within categoric knowing.