Explaining Why: How Instructions and User Interfaces Impact Annotator Rationales when Labeling Text Data

In the context of data labeling, NLP researchers are increasingly interested in having humans select rationales , a subset of input to-kens relevant to the chosen label. We conducted a 332-participant online user study to understand how humans select rationales, especially how different instructions and user interface affordances impact the rationales chosen. Participants labeled ten movie reviews as positive or negative, selecting words and phrases supporting their label as rationales. We varied the instructions given, the rationale-selection task, and the user interface. Participants often selected about 12% of input to-kens as rationales, but selected fewer if unable to drag over multiple tokens at once. Whereas participants were near unanimous in their data labels, they were far less consistent in their rationales. The user interface affor-dances and task greatly impacted the types of rationales chosen. We also observed large variance across participants.