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Determining Negation Scope in German and English Medical Diagnoses

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Chapter Summary

One aspect of analyzing subjectivity in text is the detection of negation. Considering the case of opinion mining, where the difference between an author giving a positive or a negative judgement is of utmost importance, and this difference is often coded by means of explicit negation. This chapter focuses on application that is concerned with particular diagnoses in medical reports. "Finding negations" means identifying a negation operator and deciding on its scope, or the words representing the material that is being negated. The paper briefly mentions some related work, and introduces the negation annotation guidelines that we devised and the corpus we have built up so far. The chapter describes Negtopus, the implementation. It also takes a brief look at the prospects of using off the shelf syntax parsers for the task of negation detection. The chapter evaluates the approach and compares its performance to NegEx, a prominent competitor.

Keywords: medical reports; negation; NegEx; Negtopus; syntax parsers



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