Lexical divorce between source and target is evaluated by the existence or absence of collocations of common source and target triggers. 

Of all source super triggers found through the source domain collocation searches described above, only a small subset appear regularly or even semi-regularly near or next to a target domain word.

These patterns confirm that target domain directed searching may not be a particularly efficient or effective way of finding source domain language.

The distribution also indicates that lexical divorce between source and target triggers is a significant obstacle to those automated extraction systems which rely on close collocations between source and target lexis.

Consideration

Not all metaphorical trigger lexemes can be found through automated collocation searching. An additional obstacle to this approach is the great variability in how dense and connected the constellation of source domain triggers is within a given source domain.

University of Michigan - Ann Arbor

Google

To partially automate the identification of source domain language in a specialized corpus, researchers use collocation searching in a baseline corpus to identify source domain triggers. These triggers are lexical items that activate one or more source domains used to structure a target concept. This technique produces a list of the top collocates for each source domain label, which helps expose the metaphorical structure.

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