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Compounding stimuli controlling simultaneously present topographically different responses



Compounding stimuli controlling simultaneously present topographically different responses



Australian Journal of Psychology 28(2): 83-90



Rats (6) were trained on a 3 component multiple schedule in which barpressing was occasionally reinforced during a lights stimulus (L) and pulling a loop was occasionally reinforced during a noise stimulus (N). Neither response was reinforced when both stimuli were absent (.hivin.L + .hivin.N). For 3 rats, the compatible group, both responses could be emitted simultaneously, but for the other 3 rats, the incompatible group, the responses could not. When L and N were presented together, 2 rats from each group emitted a greater total of presses and pulls during this compound than during either L or N alone. When this summation effect occurred, it was due to an increase in the number of barpresses during the compound relative to L alone. The 2 rats that did not consistently show summation to the compound loop-pulled at a rate 2 or 3 times greater than the rate which they barpressed, while the other rats showed a much smaller relative response rate difference or none at all. There was no apparent difference in behavior between the compatible and incompatible groups during the compound test.

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