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How do object prefixes support a relationship among Trans-New Guinea languages?

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Papuan languages Map of the languages found on the Doberai Peninsula of New Guinea.

In the study of Papuan languages, object prefixes serve as a vital indicator of genetic relationships within the Trans-New Guinea family. Because bound morphological forms are highly resistant to borrowing, they provide the most reliable evidence for establishing these connections.1

Specifically, languages across the region—stretching from the Huon Peninsula to the highlands of Papua—share a consistent system for marking the objects of transitive verbs. In this system, a first-person singular object is marked with the prefix /n-/, while a second-person singular object is marked with a velar stop.1

Linguists consider the likelihood of such a specific, complex system being borrowed between unrelated languages to be vanishingly small. Consequently, the presence of these shared verbal prefixes is used to demonstrate that these languages are genetically related, forming the core of the Trans-New Guinea family.12