Plaque Tournante

Plaque tournante — literally "revolving junction" or "turntable" — is Lacan's re-theorisation of phobia not as a discrete clinical structure in its own right but as a topological pivot point within the field of neurosis. Rather than constituting a stable, self-enclosed position like hysteria or obsessional neurosis, phobia functions as a switching mechanism: the phobic object operates as a signifier that lacks univocal, fixed sense, and precisely because of this floating, polysemous character it enables the subject to negotiate — to route around — the impasses that block passage from the register of the Imaginary to that of the Symbolic. The phobic object is not simply a feared thing; it is a makeshift signifier pressed into service as a surrogate for what the Symbolic cannot yet supply.

This gateway or junction function gives phobia its peculiar diagnostic instability: it is not simply a sub-type of neurosis but a transitional formation that can tend toward either of the two major neurotic positions (hysteria, obsessional neurosis) or even toward perversion. Structurally, the plaque tournante concept aligns with the broader Lacanian insight that anxiety — the affect most proximate to phobia — is managed, but never resolved, by symbolic substitution. The phobic object stands in for the phallic signifier (itself a stop-gap for the Name-of-the-Father) and thereby permits a minimal symbolic organisation of jouissance; but because this solution is inherently unstable, phobia remains in permanent potential transition toward other clinical formations.

In the source evans-dylan-an-introductory-dictionary-of-lacanian-psychoanalysis-taylor-francis, the concept of plaque tournante appears in the entry on phobia and functions as a corrective to any reading that would stabilise phobia as a third, fully autonomous clinical structure alongside hysteria and obsessional neurosis. It belongs squarely within the domain of Clinical Structures, extending and complicating that canonical concept: where Clinical Structures ordinarily sorts subjects into distinct positions (neurosis/psychosis/perversion) separated by their primary mechanism (repression/foreclosure/disavowal), plaque tournante introduces a zone of structural indeterminacy — a site where subject-positions are not yet consolidated but are in passage. Phobia's intermediate status also links it to Anxiety, in that the phobic object is precisely the symbolic device the subject deploys to regulate the proximity of objet a (which, as the Anxiety entry establishes, threatens when it comes too close). The phobic object thus performs the management of anxiety through Displacement — which the Displacement entry identifies, following Lacan after Jakobson, as metonymic sliding — by laterally shifting the unbearable charge of the Real onto a bearable symbolic stand-in.

The concept further resonates with the cross-referenced Imaginary and Name-of-the-Father: the plaque tournante describes the movement from an Imaginary deadlock (where meaning is frozen and jouissance unmediated) toward Symbolic organisation anchored by paternal metaphor. Where the Name-of-the-Father is absent or insufficiently operative, phobia provides a provisional, improvisatory relay. This positions plaque tournante as both a specification of Clinical Structures (phobia is neither simply a neurosis nor a perversion but a hinge between them) and an extension of the Anxiety framework (it names the structural mechanism by which anxiety is metabolised into navigable symptom). The concept also implicitly contrasts with the Fetish: whereas the fetish arrests metonymic sliding at a single frozen object (disavowal), the revolving junction is constitutively mobile, routing subjective traffic rather than halting it.

An Introductory Dictionary of Lacanian PsychoanalysisDylan Evans · 1996 (page unknown)

One cannot see in it [phobia] a clinical entity but rather a revolving junction [plaque tournante], something that must be elucidated in its relations with that towards which it usually tends

The phrase "revolving junction" is theoretically loaded because it denies phobia the ontological density of a "clinical entity" — a fully constituted structure — and replaces it with a purely relational, directional term: a junction only exists by virtue of the paths that cross through it. The further clause "that towards which it usually tends" keeps phobia's identity permanently deferred and vectorial, pointing to the other structures (hysteria, obsessional neurosis, perversion) as its defining relata rather than any intrinsic content of its own.