BMC Med Inform Decis Mak - Detecting causality from online psychiatric texts using inter-sentential language patterns.

Tópicos

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Resumo

CKGROUND: Online psychiatric texts are natural language texts expressing depressive problems, published by Internet users via community-based web services such as web forums, message boards and blogs. Understanding the cause-effect relations embedded in these psychiatric texts can provide insight into the authors' problems, thus increasing the effectiveness of online psychiatric services.METHODS: Previous studies have proposed the use of word pairs extracted from a set of sentence pairs to identify cause-effect relations between sentences. A word pair is made up of two words, with one coming from the cause text span and the other from the effect text span. Analysis of the relationship between these words can be used to capture individual word associations between cause and effect sentences. For instance, (broke up, life) and (boyfriend, meaningless) are two word pairs extracted from the sentence pair: "I broke up with my boyfriend. Life is now meaningless to me". The major limitation of word pairs is that individual words in sentences usually cannot reflect the exact meaning of the cause and effect events, and thus may produce semantically incomplete word pairs, as the previous examples show. Therefore, this study proposes the use of inter-sentential language patterns such as ?broke up, boyfriend>, <life, meaningless? to detect causality between sentences. The inter-sentential language patterns can capture associations among multiple words within and between sentences, thus can provide more precise information than word pairs. To acquire inter-sentential language patterns, we develop a text mining framework by extending the classical association rule mining algorithm such that it can discover frequently co-occurring patterns across the sentence boundary.RESULTS: Performance was evaluated on a corpus of texts collected from PsychPark (http://www.psychpark.org), a virtual psychiatric clinic maintained by a group of volunteer professionals from the Taiwan Association of Mental Health Informatics. Experimental results show that the use of inter-sentential language patterns outperformed the use of word pairs proposed in previous studies.CONCLUSIONS: This study demonstrates the acquisition of inter-sentential language patterns for causality detection from online psychiatric texts. Such semantically more complete and precise features can improve causality detection performance.

Resumo Limpo

ckground onlin psychiatr text natur languag text express depress problem publish internet user via communitybas web servic web forum messag board blog understand causeeffect relat embed psychiatr text can provid insight author problem thus increas effect onlin psychiatr servicesmethod previous studi propos use word pair extract set sentenc pair identifi causeeffect relat sentenc word pair made two word one come caus text span effect text span analysi relationship word can use captur individu word associ caus effect sentenc instanc broke life boyfriend meaningless two word pair extract sentenc pair broke boyfriend life now meaningless major limit word pair individu word sentenc usual reflect exact mean caus effect event thus may produc semant incomplet word pair previous exampl show therefor studi propos use intersententi languag pattern broke boyfriend life meaningless detect causal sentenc intersententi languag pattern can captur associ among multipl word within sentenc thus can provid precis inform word pair acquir intersententi languag pattern develop text mine framework extend classic associ rule mine algorithm can discov frequent cooccur pattern across sentenc boundaryresult perform evalu corpus text collect psychpark httpwwwpsychparkorg virtual psychiatr clinic maintain group volunt profession taiwan associ mental health informat experiment result show use intersententi languag pattern outperform use word pair propos previous studiesconclus studi demonstr acquisit intersententi languag pattern causal detect onlin psychiatr text semant complet precis featur can improv causal detect perform

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