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In semiotics, the commutation test is used to analyze a signifying system. The test identifies signifiers as well as their signifieds, value and significance. ==The commutation test== This test is a metalingual subjective system for analysing textual or other material. It has evolved from a limited method for investigating the structure of individual signs (per Roman Jakobson). Its primary uses are to: *identify distinctive signifiers, *define their significance, and *divide material into paradigmatic classes and identify the codes to which the signifiers belong (Roland Barthes). The initial assumption is that the communication to be analysed represents both a cognitive use of the sign system and a statement that refers to the values of the addresser. The purpose of the test is therefore to illuminate the addresser's intention in using the code in this particular way. It works through a process of substitution, assessing the extent to which a change in the signifier leads to a change in the signified. The first step, therefore, is to exclude one signifier from the material to be analysed. This is a test of redundancy: to identify what meaning is lost (if any) by omitting that sign. It will be relatively unusual to find that one sign is completely superfluous, but more common to find that the contribution of the one sign to the whole meaning is relatively weak. The weakness or strength of its contribution can be calibrated more exactly by placing alternate (synonymous and antonymous) signs in the context. This will enable the analyst to make a judgement on the distinctiveness of the particular signifier chosen by the author/artist and of its value to the meaning, i.e. as more or less necessary for maintaining the meaning and/or rule structure in different occurrences. By changing the collocation between two of the existing signifiers, and so changing their original relationship, the relative significance of each signifier can be considered. Further, by also placing the original sign into different contexts, it can be seen whether the sign becomes more or less distinctive. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Commutation test」の詳細全文を読む スポンサード リンク
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