We surmise that SIUM had a difficult time grounding certain properties, as the Japanese pronoun sore can be used anaphorically or demonstratively in this kind of context (i.e., sometimes sore refers to previously-manipulated objects, or objects that are newly identified with a mouse pointer over them); the model presented in <cite>Iida et al. (2011)</cite> made more use of contextual information when pronouns were used, particularly in the combined model which incorporated gaze information, as shown above.