This study examines whether second language (L2) learners predict upcoming language prior to the verb in Japanese. Taking the dependency involving negative polarity adverbs -- "zenzen" 'at all' and "amari" '(not) very' -- as a test case, this study examined whether Japanese native speakers and L2 learners of Japanese, aided by these adverbs, generate predictions of the polarity of the sentence-final verb. The visual-world paradigm experiment revealed that both native-speaker and L2-learner groups looked progressively more at the target picture before the negated verb when the information from adverbs was available than when it was not. The pattern of results underscores the usefulness of adverbial polarity items as predictive cues and indicates that they expedite the processing of negation in Japanese. Learners successfully exploited this information to generate nativelike predictions on sentence meaning.