Check out this article, Two Kinds of Knowledge, in the Huffington Post by Stephen Downes.
Stephen writes, "If we really want to know what students learn, we need to take into account a much wider range of phenomena than how they behave in response to the production of artifacts. Perhaps it's a bit much to measure their pupil dilation, eye gaze, brain activity, blinking, breathing and body temperature, as neuromarketers do. But it shouldn't be too much to expect to be able to map their social and search activity in a learning community, as Google does."
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Source: The Huffington Post