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The computational bits left me feeling out of my depth at several points, but also feeling reassured that this wasn't science lite. And while the evolutionary bits were less challenging - and easier to read - they offered more than enough food for thought.
Apparently some people find the computation plus evolution theory controversial. Others find the ideas old hat. And Pinker himself seems to rub plenty of people up the wrong way for various reasons. Myself, I find the arguments fresh and convincing, and Pinker very enjoyable to read. He covers an awful lot of ground with great gusto, he packs the detail in and makes his points with wry humour.
A book to read once to get the gist and a second time to get the detail.
Pinker marries Darwin's theory of evolution to the latest developments in neuroscience and computation. He shows in detail how the process of natural selection shaped our entire neurological networks; how the struggle for survival selects from among our genes those most fit to flourish in our environment. Nature has produced in us bodies, brains and minds attuned to coping intelligently with whatever our environment demands. Housed in our bodies, our minds structure neural networks into adaptive programmes for handling our perceptions. Pinker concludes, "The mind is a system of organs of computation, designed by natural selection to solve the kinds of problems our ancestors faced in their foraging way of life."
Our beliefs and desires are information, allowing us to create meaning. "Beliefs are inscriptions in memory, desires are goal inscriptions, thinking is computation, perceptions are inscriptions triggered by sensors, trying is executing operations triggered by a goal." Pinker writes that the mind has a 'design stance' for dealing with artefacts, a 'physical stance' for dealing with objects, and an 'intentional stance' for dealing with people. "Causal and inferential roles tend to be in sync because natural selection designed both our perceptual and our inferential modules to work accurately, most of the time, in this world." With this down-to-earth kind of explanation, there is no need to invoke mysterious intangible powers: "We don't need spirits or occult forces to explain intelligence." Pinker sums up the recent amazing developments in neurobiology and cognitive science. This book, like those by his colleagues Daniel Dennett ('Darwin's dangerous idea' and 'Consciousness explained') and Richard Dawkins ('River out of Eden' and 'Unweaving the rainbow'), should be required reading. They are all Darwinians, but then why shouldn't they be? It is just like saying that all physicists are Einsteinians nowadays, or that all poets and playwrights are Shakespeareans, or that all osteopaths are Stillians. Their books make Karl Popper, so hostile to Darwin, and Californian gurus like Fritjof Capra, sadly outdated.
By giving coherent, intelligible accounts of the ways in which our bodies and minds have evolved, writers like Pinker can help us to understand better how and why our bodies work in the ways they do.
It is like a book titled "How a clock works". Read more
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