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Where does the mind stop and the rest of the world begin? The question invites two standard replies. Some accept the demarcations of skin and skull, and say that what is outside the body is outside the mind. Others are impressed by arguments suggesting that the meaning of our words "just ain't in the head", and hold that this externalism about meaning carries over into an externalism about mind. We propose to pursue a third position. We advocate a very different sort of externalism: an active externalism, based on the active role of the environment in driving cognitive processes.

It is not just the presence of advanced external computing resources which raises the issue, but rather the general tendency of human reasoners to lean heavily on environmental supports. Thus consider the use of pen and paper to perform long multiplication (McClelland et al 1986, Clark 1989), the use of physical re-arrangements of letter tiles to prompt word recall in Scrabble (Kirsh 1995), the use of instruments such as the nautical slide rule (Hutchins 1995), and the general paraphernalia of language, books, diagrams, and culture. In all these cases the individual brain performs some operations, while others are delegated to manipulations of external media.

In these cases, the human organism is linked with an external entity in a two-way interaction, creating a coupled system that can be seen as a cognitive system in its own right. All the components in the system play an active causal role, and they jointly govern behavior in the same sort of way that cognition usually does. If we remove the external component the system's behavioral competence will drop, just as it would if we removed part of its brain. Our thesis is that this sort of coupled process counts equally well as a cognitive process, whether or not it is wholly in the head.

Beyond Brainstorming: Sustained Creative Work With Ideas Marlene Scardamalia and Carl Bereiter

(1)The challenge in all knowledge-based organizations is sustained creativity: working with and developing ideas into powerful and useful processes, products, or theories(2). Coming up with the initial idea represents one small step; creative knowledge workers are able to make something of the idea. Developing a capacity for sustained creative work with ideas is a new challenge for education.

This is quite at variance with the norms of every knowledge-based enterprise. Whether in pure research or industry, ideas are always assumed to be improvable. It is assumed that every theory or design will eventually be replaced by a better one, and creative knowledge workers of all sorts strive to bring this about. The engineer who declares “I have designed the ultimate automobile; there can be no further improvements” would soon be out of a job, replaced by someone with ideas for improvement. If students are to feel at home in the Knowledge Society, they must learn to feel comfortable with the knowledge that their own ideas, no matter how satisfactory they may seem at present, are improvable – and that improving them is their job, not something that a teacher or mentor can be expected to do for them.