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Abstract: In this paper we argue that a “hidden link” correlates discourse processing and spatial navigation. Specifically, we argue that two navigational systems (planning the route and landmark knowledge) can be profitably used to account for the analysis of the coherence of the flow of discourse. Consistent with this hypothesis, some brain regions activated by spatial navigation tasks are strikingly overlapping with the regions involved in discourse processing. Moreover, brain damaged people have severe deficits at the level of discourse processing that can be interpreted in terms of an impaired navigational capacity to orient themselves in the flow of discourse. [Copyright &y& Elsevier]

Abstract: In languages like English or German, definite and indefinite markers serve to distinguish given/old from new information in the discourse model. Japanese, in contrast, lacks definiteness markers, but has a topic marker. The present paper examines how the information status of a noun phrase (NP) in Japanese is represented and integrated into the discourse model. An ERP experiment investigated the processing of topic-marked and non-topic-marked NPs following three different context sentences (making available a given, inferred, or new reading). The results revealed an increase in the N400 as a function of contextual cueing, i.e. the less accessible a referential expression is in the discourse model (i.e. given, inferred, new referent), the more pronounced is the amplitude of the N400. In addition, a late positivity was observed for topic shift, i.e. when topic-marked NPs occurred after contexts in which they were not already the established topic. Crucially, topic shift was facilitated by a particular semantic relation. Since acceptability ratings cannot account for the observed pattern, the positivity is considered to reflect costs from the establishment of a new discourse topic. From a cross-linguistic perspective, the data reveal that contextual cues universally influence discourse integration (N400), while processes subserving the updating of discourse structure (e.g., topic shift) differ across languages (late positivity): Discourse updating is guided by the given-new distinction in German and by topicality in Japanese (at least in canonical word order). [Copyright &y& Elsevier]

The purpose of this study was to compare the discourse profiles of 30 nursing home residents with dementia and of 30 healthy older adults. A total of 60 transcripts of interview style conversations were analyzed using a discourse analysis schema. The results revealed a higher frequency of discourse building features, such as coherence and cohesion, for healthy adults compared to adults with dementia. Conversely, discourse-impairing features, such as disruptive topic shifts and empty phrases, were found more often in conversations of adults with dementia compared to healthy adults. Conversational partners deviated from their conversation protocol when talking to adults with dementia by including facilitative strategies in the conversation. Discourse features in interview style conversations in adults with dementia reflect declines in their memory. [Copyright &y& Elsevier]