The appeal of the new methods is clear: if an aspect of reasoning is genuinely universal, part of the human genetic endowment, then such reasoning might be manifest in massive cross-cultural samples, in subjects not yet exposed to any culture, such as very young infants, and perhaps even in the biological structure of our reasoning organ, the brain.
How far have these technologies come in teaching us new truths about our moral selves? How far could they go? And what will be the implications of a new biopsychological science of natural morality? “The truth, if it exists, is in the details,” wrote Wilson, and therefore I will concentrate on the details of three sets of very recent experiments, each of which approaches the problem using a different method: an Internet survey, a cognitive study of infants, and a study of brain imaging. Each is at the cutting edge of moral psychology, each is promising but flawed, and each should be greeted with a mix of enthusiasm and interpretative caution.
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