Animal Cognition: Proceedings of the Harry Frank Guggenheim Conference, June 2-4, 1982

By H. S. Terrace; H. L. Roitblat et al. | Go to book overview
THRESHOLD FIG. 26-11. Response probability functions for the absolute and relative response rules produced by variation in the threshold of the comparator. The absolute discrepancy rule results in constant variance similarly to the switch case, while the relative discrepancy rule results in scalar variance similarly to the pacemaker rate case.

but increasing spread, so that in the lower right panel near superposition is obtained, similarly to the lower right panel of Figure 26.9, for scalar pacemaker rate variance.

In both threshold cases, however, the function forms are different They are sharply peaked and, in fact, discontinuous at T = S+. The discontinuity stems from the possibility in theory that occasional negative threshold values may preclude responding for any discrepancy. If the account is altered to constrain all thresholds positive, then an alternative difficulty arises. Accuracy at T = S+ is always perfect. Unless further modified, these features make it unlikely that the smooth shoulders and less than perfect accuracy we see in Figure 26.2 may be reconciled with threshold variance alone.


VII. SUMMARY

Our conclusion from this analysis is that an information processing model that satisfies the proportionality or superposition finding may be obtained from an appropriate selection of a response rule and an adroit introduction of variance in the structures we describe. An absolute response rule

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