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Alternatively, the variation in our intelligence may have arisen from a process called "genetic drift", after human civilisation eased the challenges driving the evolution of our brains. Gerald Crabtree at Stanford University in California is one of the leading proponents of this idea. He points out that our intelligence depends on around 2000 to 5000 constantly mutating genes. In the distant past, people whose mutations had slowed their intellect would not have survived to pass on their genes; but Crabtree suggests that as human societies became more collaborative, slower thinkers were able to piggyback on the success of those with higher intellect. In fact, he says, someone plucked from 1000 BC and placed in modern society, would be "among the brightest and most intellectually alive of our colleagues and companions"
THOMAS W. MALONE is the Patrick J. McGovern Professor of Management at the MIT Sloan School of Management and the founding director of the MIT Center for Collective Intelligence. He was also the founding director of the MIT Center for Coordination Science and one of the two founding co-directors of the MIT Initiative on "Inventing the Organizations of the 21st Century".
Pretty much everything I'm doing now falls under the broad umbrella that I'd call collective intelligence. What does collective intelligence mean? It's important to realize that intelligence is not just something that happens inside individual brains. It also arises with groups of individuals. In fact, I'd define collective intelligence as groups of individuals acting collectively in ways that seem intelligent. By that definition, of course, collective intelligence has been around for a very long time. Families, companies, countries, and armies: those are all examples of groups of people working together in ways that at least sometimes seem intelligent.