Citation

Yeh E, Jarrold W, Jordan J. Biomed. Inform. Insights 2012; 5(Suppl 1): 155-163.

Affiliation

SRI International, Menlo Park, CA.

Copyright

(Copyright © 2012, Libertas Academica)

DOI

10.4137/BII.S8979

PMID

22879772

PMCID

PMC3409487

Abstract

We describe the submission entered by SRI International and UC Davis for the I2B2 NLP Challenge Track 2. Our system is based on a machine learning approach and employs a combination of lexical, syntactic, and psycholinguistic features. In addition, we model the sequence and locations of occurrence of emotions found in the notes. We discuss the effect of these features on the emotion annotation task, as well as the nature of the notes themselves. We also explore the use of bootstrapping to help account for what appeared to be annotator fatigue in the data. We conclude a discussion of future avenues for improving the approach for this task, and also discuss how annotations at the word span level may be more appropriate for this task than annotations at the sentence level.

Language: en