IMPORTANCE OF STIMULUS AND RESPONSE.--Like all other tissues of the
body, the nerve cells and fibers are developed by judicious use. The
sensory and association centers require the constant stimulus of nerve
currents running in from the various end-organs, and the motor centers
require the constant stimulus of currents running from them out to the
muscles. In other words, the conditions upon which both motor and
sensory development depend are: (1) A rich environment of sights and
sounds and tastes and smells, and everything else which serves as proper
stimulus to the sense organs, and to every form of intellectual and
social interest; and (2) no less important, an opportunity for the
freest and most complete forms of response and motor activity.
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