Humans today have the ability to use language. The common ancestor of chimpanzees and humans probably did not. During recent decades evolutionary linguists have attempted to explain how the gap between a non-linguistic ancestor and our linguistic species was bridged. In this direction, it has become common to invoke the notion of a protolanguage as a stable intermediary stage in the evolution of language. A key dispute among the currently-available hypotheses of protolanguage is represented by the distinction between holistic and synthetic accounts: did human protolanguage consist of holistic utterances – later segmented into single words – or did it start with simple units that were added together into more complex structures? The syn...