This article explores the issue of second language (L2) acquisition of argument structure as it relates specifically to Spanish psych-verbs. These predicates are classified into three classes according to their distinct aspectual nature, which corresponds to different morphosyntactic properties. This study tests L2 learners’ ability to understand these subtle distinctions in spite of the impoverished input to which they are exposed and the lack of instruction and first language (L1) transfer. In particular, the research questions I explore are the following: (1) Are L2 learners aware of the fact that Class III has two possible word order configurations while Class II allows only one? (2) Do L2ers recognize that Class II allows antipassive se whereas Class III does not?

A control group of 36 native Spanish speakers and an experimental group of 65 native English learners of Spanish across four proficiency levels conducted two scalar grammaticality judgment tasks. Their data, analyzed through repeated-measures ANOVA, showed that these L2ers had a good understanding of the morphosyntactic reflexes that distinguish eventive and stative psych-verbs.

Since these properties could neither have been learned through instruction nor transferred from the L1 or accessed straightforwardly from the input, learners must have resorted to universal mappings between meaning and syntax in order to achieve these target-like patterns of behavior.

Although the acquisition of argument structure has been the topic of a considerable amount of early research in the field, this article looks at a completely novel instantiation of argument structure and its learnability.

This study contributes with new data to the long-standing debate on the poverty-of-the-stimulus (POS) argument by supporting positions that contend that L2 acquisition is characterized by a logical problem and that L2 learners can successfully overcome this POS by resorting to universal principles.