Appendix B.4 Custom sample directionality

The following table contains only systems that are classified as asymmetrical (i.e., there is a zero somewhere within the system). ‘ID’ is a unique system identifier (see other appendices), and ‘form’ indicates whether a condition triggers overt indexing, zero indexing, or alternation (overt or zero; i.e., there is another condition at play). The conditions columns are labelled as follows: referential conditions: ‘pers’= person, ‘num’ = number, ‘anim’ = animacy, ‘prom’ = discourse prominence, ‘def’ = definiteness, ‘event’ = semantic transitivity, ‘co-occ’ = co-occurrence of a conominal, ‘pol’ = polarity.

Due to the complexity of multifactorial systems, this table does not show factor combinations; that is, each condition column matches only to the form column, not to the other condition columns. For example, for Aguaruna A indexing (ID = 1), plural number alternates, while singular number triggers zero indexing; ‘other’ (i.e., non-default) verb classes trigger alternating indexing, while default classes trigger zero. It is NOT the case that ‘singular + default = zero indexing’, but that ‘singular = zero’ and ‘default = zero indexing’. That is, singular is zero-indexed regardless of verb-class condition, and default verb classes have zero indexing regardless of number.