The present study investigated recognition of event type in the course of sentence comprehension by conducting three experiments on the processing of aspectual information in Japanese. The literature on theoretical syntax and semantics has reported that aspectual properties of verbs and modifying expressions play important roles in determining the event-type of sentences. Psycholinguistics literature on aspectual processing demonstrated that aspectual incompatibility between verbs and modifiers increases processing cost (Piñango, Zurif, & Jackendoff, 1999; Todorova, Straub, Badecker, & Frank, 2000). Since these studies examined processing cost for constructions with modifiers following verbs in head-initial languages like English, we first investigated if aspectual incompatibility increases processing cost in Japanese, a head-final language, wherein modifiers must precede verbs. Experiment 1 examined aspectual incompatibility between temporal adverbs and verbs. The result showed that aspectual incompatibility leads to a reading time slowdown. Second, we examined how grammatical aspect encoded by the aspect marker interacts with lexical aspect of verbs. The result of Experiment 2 showed that the combination of verbs and aspectual markers are processed simultaneously in determining the aspectual properties of sentences. Third, we examined whether aspectual information is processed incrementally, i.e. processed before verbs. The result of experiment using numeral quantifiers showed that aspectual incompatibility increased reading time even if the verb is not yet processed. Overall, this study showed that aspectual information is processed incrementally and yields strong prediction for aspectual properties of upcoming elements. Recognition of event-type can be achieved based on such aspectual information during the course of sentence comprehension.