Addressed whether hierarchical relations and word order can be separated in sentence production. Assessed in two experiments whether subject-verb agreement errors require linear proximity of a so-called "local" noun to the verb. Found evidence for a stage in language production in which a syntactic structure is built prior to stage in which words…

The basic-operations hypothesis predicts that for any transformation which is composed of more than one basic operation, there exists a class of errors in children's speech correctly analyzed as failure to apply one (or more) of the operations specified in the adult formulation of the rule. (Author/CTM)

Reports four experiments examining subject-verb agreement errors in Spanish and English. Discusses cross-linguistic differences within the framework of the computational model of grammatical encoding proposed by Kempen and Hoenkamp. Suggests that languages differ in the extent to which the selection of the verb is controlled by features on the…