Future Shock

by Alvin Toffler

An organism's ability to cope with sensory input is dependent upon its physiological structure. The nature of its sense organs and the speed with which impulses flow through its neural system set biological bounds on the quantity of sensory data it can accept. If we examine the speed of signal transmission within various organisms, we find that the lower the evolutionary level, the slower the movement. Thus, for example, in a sea urchin egg, lacking a nervous system as such, a signal moves along a membrane at a rate of about a centimeter an hour. Clearly, at such a rate, the organism can respond to only a very limited part of its environment. By the time we move up the ladder to a jellyfish, which already has a primitive nervous system, the signal travels 36,000 times faster: ten centimeters per second. In a worm, the rate leaps to 100 cps. Among insects and crustaceans, neural pulses race along at 1000 cps. Among anthropoids the rate reaches 10,000 cps. Crude as these figures no doubt are, they help explain why man is unquestionably among the most adaptable of creatures. Yet even in man, with a neural transmission rate of about 30,000 cps, the boundaries of the system are imposing. (Electrical signals in a computer, by contrast, travel billions of times faster.) The limitations of the sense organs and nervous system mean that many environmental events occur at rates too fast for us to follow, and we are reduced to sampling experience at best. When the signals reaching us ...

Nervous System CPS