Researchers focusing on Categorization are generally dealing with a very simplified (and overly academic) view of the world -- where the task is to categorize a single input stimulus. The problem is that if we want a Theory of Concepts that will be the backbone of intelligent agents, we have to deal with relationships between concepts with as much fervor as the representations of concepts themselves. While the debate concerning exemplars vs. prototypes has been restricted to these single stimulus categorization experiments, it is not clear to me why we should prematurely adhere to one of these polarized views before we consider how we can make sense of inter-category relationships. In other words, if an exemplar-based view of concepts looks good (so-far) yet it is not as useful for modeling relationships as a prototype-view, then we have to change our views. Following James' pragmatic method, we should evaluate category representations with respect to a larger system embodied in an intelligent agent (and its ability to cope with the world) and not the overly academic single-stimulus experiments dominating experimental psychology.
On another note, I submitted my most recent research to NIPS last week (supersecret for now), and went to a few Phish concerts. I'm driving to California next week and I start at Google at the end of June. I also started reading a book on James and Wittgenstein.
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