Archive image from page 61 of Design for a brain; the. Design for a brain; the origin of adaptive behavior . designforbrainor00ashb Year: 1960 DESIGN FOR A BRAIN 4/6 of behaviour must resemble that sketched in Figure 4/5/3. The other lines of the field could be added by considering what would happen after other disturbances (lines starting from points other than A). Although having different initial states, all the lines would converge towards 0. 4/6. In some of our examples, for instance that of the cube, the lines of behaviour terminate in a point at which all movement ceases. In other exa
Archive image from page 61 of Design for a brain; the. Design for a brain; the origin of adaptive behavior . designforbrainor00ashb Year: 1960 DESIGN FOR A BRAIN 4/6 of behaviour must resemble that sketched in Figure 4/5/3. The other lines of the field could be added by considering what would happen after other disturbances (lines starting from points other than A). Although having different initial states, all the lines would converge towards 0. 4/6. In some of our examples, for instance that of the cube, the lines of behaviour terminate in a point at which all movement ceases. In other examples the movement does not wholly cease; many a thermostat settles down, when close to its resting state, Figure 4/5/3 : One line of behav- to a regular small oscillation, iour in the field of the Watt's We shall seldom be interested in governor. For clarity, the resting .. , . ., „ , . , state of the system has been used the details ot what happens at as origin. The system has been the exact centre, displaced to A and then released. 4/7. More important is the underlying theme that in all cases the stable system is characterised by the fact that after a displace- ment we can assign some bound to the subsequent movement of the representative point, whereas in the unstable system such limita- tion is either impossible or depends on facts outside the subject of discussion. Thus, if a thermostat is set at 37° C. and displaced to 40°, we can predict that in the future it will not go outside specified limits, which might be, in one apparatus, 36° and 40°. On the other hand, if the thermostat has been assembled with a component reversed so that it is unstable (S. 4/14) and if it is displaced to 40°, then we can give no limits to its subsequent temperatures; unless we introduce such new topics as the melting- point of its solder. 4/8. These considerations bring us to the definitions. Given the field of a state-determined system and a region in the field, the region is stable if
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