In recent years several philosophers have broached the idea that mind should not be considered to be something which is just in the head but in various ways can be spread out onto the world.

This is a materialist rather than spiritualist notion, the mind being thought of as extending over the brain, external language and media such as charts, diaries and indeed any material substrate that can become intimately involved in our mindful actions.

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One of the proponents of this view is Andy Clark

Andy Clark

Andy Clark is a Professor of Philosophy and Chair in Logic and Metaphysics at the University of Edinburgh in Scotland. Before this he was director of the Cognitive Science Program at Indiana University in Bloomington. Previously, he taught at Washington University at St. Louis and the University...

. He illustrates the concept with an example that deals with a specific group of Alzheimer's patients in St. Louis

St. Louis, Missouri

St. Louis is an independent city on the eastern border of Missouri, United States. With a population of 319,294, it was the 58th-largest U.S. city at the 2010 U.S. Census. The Greater St...

(from p. 140 of the book Natural-Born Cyborgs):

These patients were a puzzle because although they still lived alone, successfully, in the city, they really should not have been able to do so. On standard psychological tests they performed rather dismally. They should have been unable to cope with the demands of daily life. What was going on?

A sequence of visits to their home environments provided the answer. These home environments, it transpired, were wonderfully calibrated to support and scaffold these biological brains. The homes were stuffed full of cognitive props, tools, and aids. Examples included message centers where they stored notes about what to do and when; photos of family and friends complete with indications of names and relationships; labels and pictures on doors; "memory books" to record new events, meetings, and plans; and "open-storage" strategies in which crucial items (pots, pans, checkbooks) are always kept in plain view, not locked away in drawers.

Before you allow this image of intensive scaffolding to simply confirm your opinion of these patients as hopelessly cognitively compromised, try to imagine a world in which normal human brains are somewhat Alzheimic. Imagine that in this world we had gradually evolved a society in which the kinds of scaffolding found in the St. Louis home environments were the norm. And then reflect that, in a certain sense, this is exactly what we have done. Our own pens, paper, notebooks, diaries, and alarm clocks complement our brute biological profiles in much the same kind of way. Yet we never say of the artist, or poet, or scientist, "Oh, poor soul -- she is not really responsible for that painting/theory/poem; for don't you see how she had to rely on pen, paper, and sketches to offset the inadequacies of her own brain?"