CHAPTER VIII--CONCENTRATION IN DELIVERY
Try to rub the top of your head forward and backward at the same time that you are patting your chest. Unless your powers of cooerdination are well developed you will find it confusing, if not impossible. The brain needs special training before it can do two or more things efficiently at the same instant. It may seem like splitting a hair between its northand northwest corner, but some psychologists argue that _no_ brain can think two distinct thoughts, absolutely simultaneously--that what seems to be simultaneous is really very rapid rotation from the first thought to the second and back again, just as in the above-cited experiment the attention must shift from one hand to the other until one or the other movement becomes partly or wholly automatic.
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