AN EXPERIMENTAL INVESTIGATION OF THE INPUT AND ERROR CORRECTION STRATEGIES USED BY SUBJECTS ENTERING DIGITS WITH THE AURIX SPEECH RECOGNISER

An experiment was performed which investigated the input and error correction strategies used by subjects when entering digit strings with the Aurix recogniser. Subjects were allowed to control the point at which they received feedback and corrected misrecognitions throughout the trial. It was predicted that they would alter their input strategies as a result of an entry being misrecognised. Specifically it was hypothesised that following a misrecognition, further attempts at entry of that data would use smaller digit input chunks, which should increase the likelihood of success. Comparison of the mean chunk sizes used in error-full compared to error-fi-ee interactions showed this to be the case. Some preliminary modelling work was also undertaken based on the experimental results. This suggests that the choice of input chunk size used by subjects approaches the optimal value based on the recognition accuracy obtained with the system.