|1||Touch the LARGE blue square.|
|2||Touch the large blue square.|
The use of contrastive stress on large makes best sense if a large object is being contrasted with a small object. There is only one pair of objects that differ only in size - the two blue squares. Therefore the early movment of eye-gaze to the large blue square when listeners hear large in sentence 1 shows that they efficiently interpret stress cues in the most appropriate way for the situation. When they hear large in sentence 2, it is not marked as constrastive, and largeness is only non-contrastive for the green circle, so that is where eye movements would be predicted to go.