Through contstant concentration and visual input, Ian Waterman, slowly learnt to move again. He was able to do so by planning, and concentrating on, every movement his body had to make in order to produce the desired action. However, in doing so, he found he could only do one thing at a time. It took so much concentration just to move one leg, that he could not move his arm simultaneously, for then the concentration would have to shift to his arm, and he would lose control of his leg. Moreover, if he was to, shall we say, hold an egg, he could not walk at the same time.
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