The TRDEV list this week was the location of an entertaining debate about whether the common distinction between left-brain and right-brain (as expressed, say, in this BBC Report) has any scientific merit. I am inclined to agree with theorists such as Stephen Kosslyn (an expert on mental imagery) who say that "is simply too crude to be scientifically or practically useful." But this statement, attributed to Jerre Levy, is wrong: "since the central premise of the (left-brain, right-brain) mythmakers is wrong, so are all the inferences derived from it." This is a fallacy; people can be right about something even though their reasoning is flawed. What the inferences lack, though, is proof.
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