ch include the mind's store of meaningful material both in permanent and transient memory systems. Bourne et al. go on to note that at the other end of this range is the more restricted definition in which semantic memory is conceptualized as:
. . . a system that contains word meanings and rules for operating on them. The system includes general world knowledge but not our transient memory of a particular sentence (p. 175).
There is as yet a lack of scientific consensus regarding the operations and processes of semantic memory. Instead, as pointed out by Snodgrass, Levy-Berger and Haydon (1985), there are several theoretical models which have been developed as possible explanations of these operations and processes. However, the major theories of semantic memory explicate how concepts are stored. In this regard, Snodgrass, Levy-Berger and Haydon (1985) have noted:
The major task of most models of semantic memory concern how subset (subordinate) and superset (superordinate) relati
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