Archive image from page 164 of Design for a brain (1954). Design for a brain . designforbrain00ashb Year: 1954 DISTURBED SYSTEMS AND HABITUATION 13/9 13/8/3. Two units are interacting : 1 ± 2. Both effects go through the uniselectors, so the whole is ultrastable. At each D, the operator displaced l's magnet through a constant distance. On the first c stimulation ', 2's response brought the system to its critical states, so the ultrastability found a new terminal D Time Figure 13/8/2 : Homeostat tracing. At each D, l's magnet is displaced by the operator through a fixed angle. 2 receives th
Archive image from page 164 of Design for a brain (1954). Design for a brain . designforbrain00ashb Year: 1954 DISTURBED SYSTEMS AND HABITUATION 13/9 13/8/3. Two units are interacting : 1 ± 2. Both effects go through the uniselectors, so the whole is ultrastable. At each D, the operator displaced l's magnet through a constant distance. On the first c stimulation ', 2's response brought the system to its critical states, so the ultrastability found a new terminal D Time Figure 13/8/2 : Homeostat tracing. At each D, l's magnet is displaced by the operator through a fixed angle. 2 receives this action through its uniselector. When the uniselector's value makes 2's magnet meet the critical states (shown dotted) the value is changed. After the fourth change the value causes only a small movement of 2, so the value is retained permanently. -\rv Time Figure 13/8/3 : Homeostat arranged as ultrastable system with two units interacting. At each D the operator moved l's magnet through a fixed angle. The first field such that D does not cause a critical state to be met is retained permanently. field. The second stimulation again evoked the process. But the new terminal field was such that the displacement D no longer caused 2 to reach its critical states ; so this field was retained. Again under constant stimulation the response had diminished. 13/9. For completeness we will now consider the effects of these disturbances in combination. The combination of repeated constant displacements with small random disturbances yields little of interest. But the combination of an alternation of para- meter-value with small random disturbances is worth notice. 149 l
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