Hilary Putnam

Gareth Evans died of cancer when he was barely 34 years of age. He had been working on this book for several years; the task of completing it from his notes was carried out by John McDowell. (The first two chapters and the introduction were rewritten by Evans himself in the last months of his life.) Evans’s death at such an early age is a tragedy. We can have no real idea what his mature years might have brought forth, and this book is no substitute for those additional years of life and thought: it is the desperate attempt of a young man on his deathbed to leave a lasting mark on his profession. I do not like – in fact I hate – to say that he did not (in my opinion) succeed. And I apologise to those who will feel personally hurt at a negative review of a work produced by a vital person whom they knew and loved and miss today.–

Margaret Boden’s somewhat breathless book sings the praises of the new ‘computational’ models in psychology and of what she rightly calls ‘the computational metaphor’. A feature of her writing is the making of (what seem to be) strong claims followed or prefaced by judicious disclaimers. When she is functioning in what I am tempted to call her disclaimer mode, she warns us against various kinds of intellectual ‘imperialism’ that AI people engage in at times (‘AI’ is the acronym for Artificial Intelligence – computer simulation of ‘intelligent’ behaviour), urges a Popperian stance of trying to falsify strong claims, and even denies that computers could in principle be conscious or have intentional states (in a non-metaphorical sense). But when she is functioning in her selling mode we get claims like this: ‘We now have machines with a point of view of their own, machines with a subjective model (representation) of the world and their own actions in it by means of which they deliberate more or less carefully about what they should do and what they should not have done and why. The insidiously dehumanising effects of mechanism can thus be counteracted in a scientifically acceptable manner. By providing a richer image of machines that suggests how it is that subjectivity, purpose and freedom can characterise parts of the material world, current science helps us to understand how human values can be embodied in a mechanistic universe.’