Universal #1659

Legacy number: 1659

 Number  1654
 Original  The Evidentiality Hierarchy:
visual > non-visual > inferential > quotative, OR direct > indirect.

The presence of evidentials encoding direct evidence, such as visuals and sensory evidentials, entails the presence of indirect evidentials, such as quotatives and (some) inferentials.
 Standardized  IF there are evidentials encoding direct evidence, THEN there are evidentials for indirect evidence.
IF there is an evidential category for visual evidence, THEN there is evidential category for non-visual evidence.
IF there is an evidential category for inferential evidence, THEN there is evidential category for quotative evidence.
 Formula  visual > non-visual > inferential > quotative, OR direct > indirect
 Keywords  evidentiality hierarchy
 Domain  inflection, syntax, semantics
 Type  implicational hierarchy
 Status  achronic
 Quality  statistical
 Basis  30 languages from all areas of the world where evidentiality is well-established as a grammatical category, including Archi (NE Caucasian), Dolakha Newari (Tibeto-Burman), Ocotepec Mixtec (Oto-Manguean), Mam (Mayan), Basque (isolate), Paumari (Arawakan), Urubu-Kaapor (Kariri-Tupi), Yukaghir (isolate), Dutch (Germanic, IE), Kalmyk (Mongolian), Abkhaz (N Caucasian), Limbu (Tibeto-Burman), Yup’ik (Eskimo-Aleut), Cayuga (Iroquoian), Kwakiutl (Wakashan), Patwin (Wintuan (=Copehan)), Lega (Central Bantu, Niger-Congo), Turkish (Turkic), SE Tepehuan (Uto-Aztecan), Mingrelian (S Caucasian), Hixkaryana (Carib), Iquito (Zaparoan), Akha (Lolo-Burmese), Hupa (Athabaskan), Maricopa, Hualapai (both Yuman), Tuyuca (Tucanoan), Fasu (Trans-New Guinea), Kashaya (Hokan)
 Source  De Haan 1996

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Discussion
Counterexamples
Hualapai (Yuman), and possibly Hupa (Athabaskan), which possess direct evidentials but no (grammaticalized) quotative evidentials. Apalai (Carib) has visual and inferential evidentials but lacks non-visual sensory evidential (this may be due to insufficient information in grammar) (De Haan 1996).