SRS/E is an experimental system. By their nature such experimental systems are vehicles for extension and enhancement. The SRS/E algorithm is a working and workable implementation of the Dynamic Expectancy Theory, but there is scope for additional capability. This section describes a small number of the possibilities. A component part of MacCorquodale and Meehl's interpretation of Tolman's expectancy theory proposed a separate sign to sign associative effect (denoted " S 2 S "). Such pairings may in particular record the association of arbitrary signs (S 2) to signs (S) specifically identified as relating to desirable goal situations; the secondary cathexis postulate. The creation of a separate Association List, ¡ ¡ , within SRS/E would allow the attachment of multiple (secondary) goal states to a single (primary) goal definition. Signs detected as occurring concurrently with, or slightly preceding (giving a predictive element to the association) a predefined goal sign would be paired with the desired sign and this association saved on ¡ ¡ , figure 7-1. The strength of this association being subject to strengthening by mnemonization and weakening by extinction processes based on the frequency and temporal adjacency of the pairing.
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