This study explores the processing differences in unaccusative, unergative
and transitive predicates in Spanish. We tested the Unaccusative Hypothesis
using eye-tracking and the Visual World Paradigm by measuring argument
reactivation, a processing phenomenon that reflects the integration of an
argument with the verb. Our results reveal that agents (i.e. unergative and
transitive subjects) display a common processing pattern, showing an
earlier and larger reactivation effect after the verb, whereas themes (i.e.
unaccusative subjects) show a later and smaller reactivation effect. These
results support the predictions made by the Unaccusative Hypothesis.