Plasticity … means the possession of a structure weak enough to yield to an influence, but strong enough not to yield all at once. Each relatively st… - William James

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Plasticity … means the possession of a structure weak enough to yield to an influence, but strong enough not to yield all at once. Each relatively stable phase of equilibrium in such a structure is marked by what we may call a new set of habits. Organic matters, especially nervous tissues, seem to be endowed with a very extraordinary degree of plasticity of this sort ...