Certain of our concepts are innate, but many others are learned. Despite the plausibility of this claim, some have argued that the very idea of concept learning is incoherent. I present a conception of learning that sidesteps the arguments against the possibility of concept learning, and sketch several mechanisms that result in the generation of new primitive concepts. Given the rational consid...

Studies of spatial and temporal distribution patterns of cancer in man and in ani mals have yielded much information and have identified many topics for more in tensive, more rigidly designed epidemiologic investigations. In fact, the wealth of such leads makes the determination of priority and the logistics of the research inn portant considerations. In addition to specific investigations, lon...

This article offers an account of embodied exchange with the world that associates conscious operations with actively inferring the causes of our sensations. Its agenda is to link formal (mathematical) descriptions of dynamical systems to a description of perception in terms of beliefs and goals. The argument has two parts: the first calls on the lawful dynamics of any (weakly mixing ergodic) s...