1. I think it is time to retire this dataset in favor of something more realistic that could be more specific about human learning. 2. The model seems overly simple. This is both a feature and a bug. 3. The characterizations are not as systematic as one would like. For example, while all models are characterized in terms of their learning dynamics and final representational structure, only two are displayed in Figure 2 for their stage-like behavior. If this is in the supplementary material, ok, but the paper should be relatively self-contained. 4. The notation is very confusing.
2. The model seems overly simple. This is both a feature and a bug.