By Stephen Grossberg
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In the network theory, without drive inputs, no amount of conditioned reinforcer input can fire the drive representations. These experiments support the hypothesis that the polyvalent cells of drive representations need simultaneously converging reinforcing and drive inputs to vigorously fire. An analogous type of experiment shows that cues can be trained to elicit appropriate behavior even if two or more drives are simultaneously active. Kendler (1946)trained rats who were simultaneously hungry and thirsty in a T maze.
9. Minimal Network Realization of Conditioned Nonspeeifie Arousal We now have enough information available to construct the minimal network capable of conditioning nonspecific arousal and using it to elicit overt behavior. We know that the CS, via cells in F ( 2 ) ,can learn to activate nonspecific arousal from A. The arousal, in turn, is needed to elicit sampling signals to F ( I ) , We now show that the CS-activated cells that sample A and that receive feedback from A cannot be the same cells.
Both stages ‘code” their CS in the sense that they are selectively activated by it. However, stage v$’ can only sample ~ ( 1 if) it also receives arousal from A. Stage v,’:’ persistently samples A, but cannot learn to activate A until a UCS occurs. Thus STM reverberation can occur at without erroneously eliciting sampling signals from vii’. A Theory of Reinforcement,Drive, Motivation, and Attention 15 csFb 3"' I ai I bl Figure 6. Networks (a) and (b) do not work because their polyvalent cells can never fire.
Adaptive Brain by Stephen Grossberg