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My current interests concern the mathematical and conceptual foundations of psychology. Most of my earlier work dealt with human linguistic abilities. I continue to work in this area, although I have also branched out to some other areas of psychology, such as color science and visual neuroscience. Much of this latter work is in collaboration with Wayne Wright.   

In the 1970s, I also did some important work in the philosophy of biology. Here, you can see my attempt to theoretically distinguish birds and reptiles.
 

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