. Design for a brain; the origin of adaptive behavior. Calculators; Central nervous system -- Mathematical models; Behavior; Brain -- physiology. DESIGN FOR A BRAIN 7/23 variables are outside their normal limits. Thus if the main variables were as few as two (for graphical purposes), the dis- tribution might be as the*dots in I of Figure 7/23/1. The dis- tribution means that the organism is in tolerable physiological conditions if the representative point stays within the undotted region. Ill. Figure 7/23/1 : Changes of field in an ultrastable system. states are dotted. The critical Suppose no
. Design for a brain; the origin of adaptive behavior. Calculators; Central nervous system -- Mathematical models; Behavior; Brain -- physiology. DESIGN FOR A BRAIN 7/23 variables are outside their normal limits. Thus if the main variables were as few as two (for graphical purposes), the dis- tribution might be as the*dots in I of Figure 7/23/1. The dis- tribution means that the organism is in tolerable physiological conditions if the representative point stays within the undotted region. Ill. Figure 7/23/1 : Changes of field in an ultrastable system. states are dotted. The critical Suppose now that the first set of values on the step-functions S gives such a field as is shown in I, and that the representative point is at X. The line of behaviour from X is not stable in the region, and the representative point follows the line to the boundary. Here (Y) it meets a critical state and a step-function changes value; a new field, perhaps like II, arises. The representa- tive point is now at Y, and the line from this point is still unstable in regard to the region. The point follows the line of behaviour, meets a critical state at Z, and causes a change of a step-function: a new field (III) arises. The point is at Z, and the field includes a state of stable equilibrium, but from Z the line leads further out of the region. So another critical state is met, another step- function changes value, and a new field (IV) arises. In this field, 96. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ashby, William Ross. New York, Wiley
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