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This paper compares explicit instruction in second-language Spanish with a control treatment on a written picture description task and a timed auditory grammaticality judgment task. Participants came from two intact, third-year US high school classes, with one experiencing a week of communicative lessons on the Spanish clitic se (n = 15) and the other exposed to se only incidentally (n = 20). Explicit instruction consisted of grammar rules with sentence-level examples, followed by communicative tasks. Three test versions were administered within a split-bloc design as a pretest, immediate posttest, and delayed posttest 6 weeks after instruction. The instructed group increased targetlike uses of se on both tasks and sustained gains through the delayed posttest, although first-language transfer errors persisted. Meanwhile, overgeneralization errors centered on semantic and syntactic contexts similar to the instructional object, aligning with the unergative–unaccusative distinction among intransitive verbs. It is argued that the data provide evidence for the permeability of second-language implicit knowledge to explicit instruction and against total encapsulation as a model of the mind. [ABSTRACT FROM PUBLISHER]

This paper examines the acquisition of interpretable features in English second language (L2) learners of Spanish by investigating the personal preposition a in Spanish. The distribution of a in direct object NPs relates to the animacy/specificity of the NP, the animacy/agentivity of the subject, and the semantics of the predicate (Torrego, 1998; Zagona, 2002); i.e., personal a is conditioned by the interpretability of semantic features. Forty-nine English L2 learners of Spanish of three different proficiency levels, and 16 Spanish controls took part in a Completion Task and an Acceptability Judgement Task. These revealed that L2 learners of Spanish of all proficiency levels behaved differently from native speakers of Spanish. The L2 learners appear to have acquired some of the interpretable features (i.e., [±animate]), but show delays with others. Nonetheless, our data show partial convergence by advanced learners with the native speakers: some features are acquirable, while others may be less accessible and subject to developmental processes. In explaining our data we appeal to Lardiere's (2008, 2009) Feature Reassembly Hypothesis, but assess it critically and aim to develop it further by considering the complexity constraints in terms of the number of features involved and their configuration. [ABSTRACT FROM PUBLISHER]