14. Multinominal processing trees

14.1 Multinomial processing model of pair-clustering

The finding that semantically related items are often recalled consecutively can be taken as evidence for the idea that they were stored and retrieved as a cluster. An MPT model assumes that observed behavior arises from a sequence of cognitive events, able to be represented by a rooted tree architecture such as the one shown in Figure 14.1.

The pair-clustering MPT model describes a simple sequence of cognitive processes that can produce these four behavioral outcomes, controlled by three parameters.

The cluster-storage parameter c is the probability that a word pair is clustered and stored in memory.
The cluster-retrieval parameter r is the conditional probability that a word pair is retrieved from memory, given that is was clustered.
The unique storage-retrieval parameter u is the conditional probability that a member of a word pair is stored and retrieved from memory, given that the word pair was not stored as a cluster.



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