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Overview of the 2017 Spoken CALL Shared Task

Type of publication Peer-reviewed
Publikationsform Proceedings (peer-reviewed)
Author Baur Claudia, Chua Cathy, Gerlach Johanna, Rayner Manny, Russell Martin, Strik Helmer, Wei Xizi,
Project Designing and evaluating spoken dialogue based CALL systems
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Proceedings (peer-reviewed)

Title of proceedings Proc SLaTE
Place Stockholm, Sweden


We present an overview of the shared task for spoken CALL. Groups competed on a prompt-response task using English-language data collected, through an online CALL game, from Swiss German teens in their second and third years of learning English. Each item consists of a written German prompt and an audio file containing a spoken response. The task is to accept linguistically correct responses and reject linguistically incorrect ones, with ``linguistically correct'' being defined by a gold standard derived from human annotations; scoring was performed using a metric defined as the ratio of the relative rejection rates on incorrect and correct responses. The task received twenty entries from nine different groups. We present the task itself, the results, a tentative analysis of what makes items challenging, a comparison between different metrics, and suggestions for a continuation.