TABLE 2.

Variables obtained from the NAVS

Abbreviation	Test	Summary
ASPT-A	Argument Structure Production Test, Code A	Verb and its arguments produced in the correct order on a picture description task.
ASPT-G	Argument Structure Production Test, Code G	Verb and its arguments produced in the correct order on a picture description task, plus the full sentence is grammatically and morphosyntactically correct
ASPT-W	Argument Structure Production Test, Code W	Absence of word-level errors (phonemic, verbal, and semantic paraphasias) in picture description
ASPT-2–1	Argument Structure Production Test, 2–1	Proportion correct ASPT-A scores for two-place minus one-place verb stimuli. A negative number indicates relatively greater difficulty with two-place verbs than with one-place verbs.
ASPT-3–1	Argument Structure Production Test, 3–1	Proportion correct ASPT-A scores for three-place minus one-place verb stimuli. A negative number indicates relatively greater difficulty with three-place verbs than with one-place verbs.
SPPT	Sentence Production Priming Test	Correctly produced target structures on a picture description task in which reversible sentences are used to prime the elicitation of specific sentence types
SCT	Sentence Comprehension Test	Correct scores on an auditory-sentence-picture matching task in which reversible sentences are used to provide binary choices
NC-C	Noncanonical minus canonical	Proportion correct scores on noncanonical structures minus canonical structures, on the SPPT or SCT. A negative number indicates relatively greater difficulty with noncanonical than with canonical sentence structures.

NAVS = Northwestern Assessment of Verbs and Sentences.