. Design for a brain; the origin of adaptive behavior. Calculators; Central nervous system -- Mathematical models; Behavior; Brain -- physiology. DESIGN FOR A BRAIN 5/12 to follow the dotted lines with a pen. The left- and right-hand curves were drawn with the respective hands. The tracing shows clearly that the co-ordination is poorer in the left hand. What criterion reveals the fact ? The essential distinction is that the deviations of the lines from the dots are larger on the left than on the right. The degree of motor co-ordination achieved may therefore be measured by the smallness of the
. Design for a brain; the origin of adaptive behavior. Calculators; Central nervous system -- Mathematical models; Behavior; Brain -- physiology. DESIGN FOR A BRAIN 5/12 to follow the dotted lines with a pen. The left- and right-hand curves were drawn with the respective hands. The tracing shows clearly that the co-ordination is poorer in the left hand. What criterion reveals the fact ? The essential distinction is that the deviations of the lines from the dots are larger on the left than on the right. The degree of motor co-ordination achieved may therefore be measured by the smallness of the deviations from some standard line. Later it will be suggested that there are mechanisms which act to maintain variables within narrow limits. If the identification of this section is accepted, such mechanisms could be regarded as appropriate for the co-ordina- tion of motor Figure 5/11/2 : Record of the attempts of a patient to follow the dotted lines with the left and right hands. (By the courtesy of Grant of Los Angeles.) 5/12. So far we have noticed in stable systems only their property of keeping variables within limits. But such sys- tems have other properties of which we shall notice two. They are also shown by animals, and are then sometimes considered to provide evidence that the organism has some power of 4 intelligence ' not shared by non-living systems. In these two instances the assumption is unnecessary. The first property is shown by a stable system when the lines of behaviour do not return directly, by a straight line, to the state of equilibrium ( Figure 4/5/3). When this occurs, variables may be observed to move away from their values in the state of equilibrium, only to return to them later. Thus, sup- pose in Figure 5/12/1 that the field is stable and that at the equilibrial state R x and y have the values X and Y. For clarity, only one line of behaviour is drawn. Let the system be displaced to A and its subsequent behaviour observed.
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Keywords: ., bookcentury1900, bookpublishernewyorkwiley, booksubjectcalculato
