ERP Responses to Violations in the Hierarchical Structure of Functional Categories in Japanese Verb Conjugation.

An event-related potential experiment was conducted in order to investigate readers' response to violations in the hierarchical structure of functional categories in Japanese, an agglutinative language where functional heads like Negation (Neg) as well as Tense (Tns) are realized as suffixes. A left-lateralized negativity followed by a P600 was elicited for the anomaly of attaching a Neg morpheme outside a Tns-marking suffix (i.e., syntactic violation of the form *[[V - Tns] - Neg]), while only P600 was observed for the anomalous form with a purely morphological/morpho-phonological violation, i.e., a Neg morpheme attached to ren'yo form instead of Neg-selecting form. The findings suggest that the syntactic structure involving Tns and Neg in Japanese, realized within a word as a sequence of suffixes, is processed in a similar manner to the syntactic structures that are phrasally realized in well-studied European languages like English.

Rendaku (Japanese sequential voicing) as rule application: an ERP study.

Japanese sequential voicing (rendaku) is a process of voicing the initial obstruent of the second member of a compound word in Japanese (e.g. hon 'book'+tana 'shelf'→hon-dana). We conducted an event-related potential measurement experiment to investigate whether rendaku is a regular process of rule application or an analogical process based on lexical memory. When rendaku was applied wrongly to words lexically specified to resist rendaku, a left anterior negativity component, followed by a P600 was observed, whereas applying rendaku against a phonological constraint known as Lyman's law elicited a P600 component alone. Failure of rendaku application where it should apply yielded an N400. These results suggest that rendaku is a process involving rule application.