Scholars and apes have different interests, but how similar is the form of their thoughts?
The thinking that supports a sentence’s basic, two-part structure of topic and comment may be much older than either humanity, the great apes, or even primates, suggests James R. Hurford in a paper in the March issue of Lingua (abstract here, paper here).
Over 40 years ago, as part of a search for linguistic universals, Charles Hocket wrote that
Every human language has a common clause type with bipartite structure in which the constituents can be reasonably be termed ‘topic’ and ‘comment.’
In English, topics and comments are generally united in a sentence that divides into a noun phrase (NP) and a verb phrase (VP); e.g., The president [topic] lied [comment]; General Sherman, on his March to the Sea, [topic] occasionally showed a little mercy [comment]. A few languages, Hurford cites the Polynesian language of Tonga, do not distinguish between nouns and verbs and therefore cannot have NPs and VPs, but they too use the topic + comment structure.
Hurford’s paper builds on the observation that a full sentence can be turned into a topic: e.g., The lying president…, Sherman’s occasional mercy on his March to the Sea…. In these phrases the topic + comment of the earlier sentence has turned into a solitary topic. Hurford examines the reason that
language has evolved in such a way that in actual English [The president lied] exists alongside [The lying president…].
That existence of two ways of stating the same proposition is the central issue of Hurford’s paper and in the course of proposing an explanation he breaks with a very old philosophical and theological tradition that says the function of language is to state the truth.
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