. Design for a brain; the origin of adaptive behavior. Calculators; Central nervous system -- Mathematical models; Behavior; Brain -- physiology. 8/5 THE HOMEOSTAT v \jây S2. Time Figure 8/5/1 : Three units interacting. At R the effect of 2 on 3 was reversed in polarity. followed 2 downward (similar movement). 3 then forced 1 up- ward, opposed the original movement, and produced stability. At R, the hand-control (2 â>â 3) was reversed, so that 2 now forced 3 to move in the opposite direction to itself. This change set up a vicious circle and destroyed the stability; but uniselector changes
. Design for a brain; the origin of adaptive behavior. Calculators; Central nervous system -- Mathematical models; Behavior; Brain -- physiology. 8/5 THE HOMEOSTAT v \jây S2. Time Figure 8/5/1 : Three units interacting. At R the effect of 2 on 3 was reversed in polarity. followed 2 downward (similar movement). 3 then forced 1 up- ward, opposed the original movement, and produced stability. At R, the hand-control (2 â>â 3) was reversed, so that 2 now forced 3 to move in the opposite direction to itself. This change set up a vicious circle and destroyed the stability; but uniselector changes occurred until the stability was restored. A forced down- ward movement of 1, at S2, demonstrated the regained stability. The tracing, however, deserves closer study. The action 2 â> 3 was reversed at R, and the responses of 2 and 3 at S2 demonstrate this reversal; for while at S± they moved similarly, at S2 they moved oppositely. Again, a comparison of the uniselector- controlled action 1 â> 2 before and after R shows that whereas beforehand 2 moved similarly to 1, afterwards it moved oppo- sitely. The reversal in 2 â> 3, caused by the operator, thus evoked a reversal in 1 â> 2 controlled by the uniselector. The second reversal is compensatory to the first. The nervous system provides many illustrations of such a series of events: first the established reaction, then an alteration made in the environment by the experimenter, and finally a. reorganisa- tion within the nervous system, compensating for the experimental alteration. The Homeostat can thus show, in elementary form, this power of self-reorganisation. 107. 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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