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In the typology of signs [[sign]]s devised by Charles S Perice, the North American semiotician, the [[index ]] is a [[sign ]] whih has an "existential relationship" to the [[object ]] it represents.(The index is always spatially or temporally contiguous with the object).
Perice contrasts the idnex swith the symbol, which, like Saussure's concept of the sign, (The [[index]] is characterized by the absence of all necessary connections between always spatially or temporally contiguous with the sign and its [[[object]]).
For examplePeirce contrasts the [[index]] swith the [[symbol]], which, like [[Saussure]]'s concept of the [[sign]], smoke is an index characterized by the [[absence]] of fireall necessary connections between the [[sign]] and its [[object]].
In Lacan's discourseFor example, the term 'index' functions in opposition to the term smoke is an [[signifierindex]]of fire.
In [[Lacan thus conceives ]]'s [[discourse]], the term "[[index as a 'natural' sign, one ]]" functions in which there is a fixed, bi-univocal correspondence between sign and object (unlike opposition to the term [[signifier, which has no fixed link with any one signified)]].
[[Lacan]] thus conceives the [[index]] as a "natural" [[sign]], one in which there is a fixed, bi-univocal correspondence between [[sign]] and [[object]] (unlike the [[signifier]], which has no fixed link with any one [[signified]]). This opposition between [[index ]] and [[signifier ]] underpins the following distinctions in [[Lacan]]'s work.
===The psychoanalytic and medical concepts of the symptom===
Whereas in medicine, the [[symptom ]] is regarded as an [[index ]] of the disease, in [[psychoanalysis ]] the [[symptom ]] is not an [[index ]] but a [[signifier]].<ref>{{E}} p.129</ref>
Hence in psychoanalysis there is no one-to-one fixed link between pathological phenomena and the underlying structure.
===Codes (animal) and language (human)===
COdes [[Code]]s are composed of [[index|indices]], whereas [[language ]] is composed of signifiers[[signifier]]s.
This explains why codes [[code]]s lack the most important feature of [[language]]: its potential for ambiguity and equivocation.
The opposition between [[signifier ]] and [[index ]] is complicated by the existence of certain signifiers [[signifier]]s whch also function as [[index|indices]]; these are called [[shiftersshifter]]s==See Also==* [[code]]
==References==
<references/>
 
 
 
==See Also==
* [[code]]
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