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Using Illusions to Boost Social Cognition (SOLLUSIONS)

19 mai 2026 mis à jour par: Hôpital le Vinatier

Socio-cognitive Benefits of Exposure to Visual Illusions in Patients With Psychotic Disorders

This study aims to explore whether the observation of complex visual objects can help improve social cognition in people living with psychotic disorders. Social cognition refers to the ability to understand what others think, feel, or intend, and plays a key role in social relationships and daily interactions.

Main questions this study aims to answer:

  • Does dyadic exposure to complex visual objects improve mental state attribution, as measured by the Faux Pas Test?
  • Does the intervention enhance related domains of social cognition, including implicit intention inference (Hinting Task), interpretation of complex interactions (Movie for the Assessment of Social Cognition, MASC), and reduction of hostile attribution biases (Ambiguous Intentions Hostility Questionnaire, AIHQ)?
  • Are improvements maintained after one month, and do patients who receive the intervention later (waitlist group) show the same benefits once exposed?

Aperçu de l'étude

Description détaillée

This study is a randomized, controlled, monocentric trial evaluating a novel sensory-motor rehabilitation approach for social cognition. The study is based on the hypothesis that perception is interpretative and viewpoint-dependent, and that realizing this through concrete experience could generalize to higher-level cognitive processes required for social understanding.

Participants will attend three visits and complete questionnaires and tasks that assess social understanding before and after the activity, and again one month later.

Two groups will take part: one completing the workshop shortly after inclusion, and one completing it after a delay, allowing comparison over time. Participants will be randomized in one condition.

This research does not involve medication. It consists of simple tasks such as observing and describing visual stimuli, followed by a facilitated discussion.

Neuropsychological tests and questionnaires will be used to measure changes over time.

Expected impact: By inducing concrete perspective-shifts, the intervention aims to improve mentalizing, reduce egocentric biases, and strengthen interpretation of social cues. This bottom-up sensory-motor approach may overcome limitations of classical cognitive remediation programs by promoting deep experiential learning rather than top-down instruction.

If effective, the method may support long-term social reintegration, psychosocial functioning, and inspire wider clinical applications due to its low cost, ease of deployment, and strong ecological engagement.

Type d'étude

Interventionnel

Inscription (Estimé)

60

Phase

  • N'est pas applicable

Contacts et emplacements

Cette section fournit les coordonnées de ceux qui mènent l'étude et des informations sur le lieu où cette étude est menée.

Coordonnées de l'étude

Sauvegarde des contacts de l'étude

Lieux d'étude

      • Bron, France, 69678
        • CH le Vinatier
        • Chercheur principal:
          • Frédéric HAESEBAERT, MD, PhD

Critères de participation

Les chercheurs recherchent des personnes qui correspondent à une certaine description, appelée critères d'éligibilité. Certains exemples de ces critères sont l'état de santé général d'une personne ou des traitements antérieurs.

Critère d'éligibilité

Âges éligibles pour étudier

  • Adulte

Accepte les volontaires sains

Non

La description

Inclusion Criteria:

  • Aged 18 to 40 years
  • Fluent French speaker
  • Has provided written informed consent
  • For individuals under guardianship (curatorship): inclusion is permitted if the curator is available to assist or advise when needed.
  • Established diagnosis of schizophrenia, schizoaffective disorder, schizophreniform disorder, or brief psychotic disorder according to theDiagnostic and statistical manual of mental disorders (DSM-5-TR) criteria
  • Presence of social cognition impairment, defined by:subjective complaint reported by the participant or identified by care teams regarding difficulties in social interaction and clinical confirmation of observable difficulties (e.g., social withdrawal, misinterpretation of others' intentions, inappropriate social behaviour)
  • Membership or entitlement to a social security plan

Exclusion Criteria:

  • Clinical state incompatible with participation in group-based activities (e.g., severe psychomotor agitation, severe behavioural disturbance)
  • Concurrent participation in another social cognition remediation program
  • Diagnosis of intellectual disability
  • Insufficient comprehension of French for verbal interaction and test completion
  • Significant change in psychotropic medication within the past month
  • Uncorrectable visual impairment preventing participation
  • Pregnant women
  • Individuals under full guardianship (tutorship)

Plan d'étude

Cette section fournit des détails sur le plan d'étude, y compris la façon dont l'étude est conçue et ce que l'étude mesure.

Comment l'étude est-elle conçue ?

Détails de conception

  • Objectif principal: Soins de soutien
  • Répartition: Randomisé
  • Modèle interventionnel: Affectation parallèle
  • Masquage: Aucun (étiquette ouverte)

Armes et Interventions

Groupe de participants / Bras
Intervention / Traitement
Expérimental: Immediate intervention
Participants receive the visual-perception session shortly after baseline assessment. They complete neurocognitive and social cognition tests before exposure, immediately after, and again at one-month follow-up.

A guided session of approximately 45 minutes. The core rehabilitation tool consists of multiple-perspective illusion boxes. Each participant stands on one side of the box and perceives a different shape than their partner. The session unfolds in 3 structured phases:

  1. For each illusion : Participants observe objects silently and draw what they see.
  2. Perspective confrontation + Card selection: Drawings and interpretation cards are exchanged and discussed.
  3. Perspective switching : Participants swap positions to reveal the alternative visual interpretation.

The session is followed by a short structured discussion with a psychologist focused on perspective-taking and interpretation of social cues.

Comparateur actif: Delayed Intervention (Wait-list Control)
Participants complete the same assessments as Arm 1 but receive the intervention only after a waiting period. This arm allows comparison between natural progression and workshop effects prior to exposure.
A guided session of approximately 45 minutes. The core rehabilitation tool consists of multiple-perspective illusion boxes. Each participant stands on one side of the box and perceives a different shape than their partner. The session unfolds in 3 structured phases: 1. For each illusion : Participants observe objects silently and draw what they see. 2. Perspective confrontation + Card selection: Drawings and interpretation cards are exchanged and discussed. 3. Perspective switching : Participants swap positions to reveal the alternative visual interpretation. The session is followed by a short structured discussion with a psychologist focused on perspective-taking and interpretation of social cues. Delivered after a delay following baseline assessment.

Que mesure l'étude ?

Principaux critères de jugement

Mesure des résultats
Description de la mesure
Délai
"Faux Pas" test total score
Délai: Change from pre to post intervention (up to 3 hours)
  1. Total of correctly recognised "Faux Pas" Score range : 0 - 30 Minimum (0) : no correct detection of faux pas Maximum (30) : all faux pas correctly detected
  2. Total of identified absence of "Faux Pas" Score range : 0 - 10 Minimum (0) : incorrectly identifies absence of faux pas Maximum (10) : correctly identifies absence of faux pas
  3. Total score of control question comprehension Score range : 0 - 20 Minimum (0) : poor comprehension Maximum (20) : Full comprehension
Change from pre to post intervention (up to 3 hours)

Mesures de résultats secondaires

Mesure des résultats
Description de la mesure
Délai
Hinting Task
Délai: Change from pre to post intervention (up to 3 hours)
  1. Number of correctly inferred items with hint 1 Score range : 0 - 20 Minimum (0) : No correct inference of intentions Maximum (20) : All intentions correctly inferred
  2. Number of correctly inferred items with hint 2 Score range : 0 - 20 Minimum (0) : No correct inference of intentions Maximum (20) : All intentions correctly inferred
Change from pre to post intervention (up to 3 hours)
MASC performance
Délai: Change from pre intervention to follow-up session (up to a month and a half)
Number of correct responses Score range 0 - 45 Minimum (0) : No correct mental state inference Maximum (45) : All mental states correctly inferred
Change from pre intervention to follow-up session (up to a month and a half)

Collaborateurs et enquêteurs

C'est ici que vous trouverez les personnes et les organisations impliquées dans cette étude.

Collaborateurs

Dates d'enregistrement des études

Ces dates suivent la progression des dossiers d'étude et des soumissions de résultats sommaires à ClinicalTrials.gov. Les dossiers d'étude et les résultats rapportés sont examinés par la Bibliothèque nationale de médecine (NLM) pour s'assurer qu'ils répondent à des normes de contrôle de qualité spécifiques avant d'être publiés sur le site Web public.

Dates principales de l'étude

Début de l'étude (Estimé)

1 juillet 2026

Achèvement primaire (Estimé)

1 janvier 2029

Achèvement de l'étude (Estimé)

1 février 2029

Dates d'inscription aux études

Première soumission

12 mai 2026

Première soumission répondant aux critères de contrôle qualité

19 mai 2026

Première publication (Réel)

22 mai 2026

Mises à jour des dossiers d'étude

Dernière mise à jour publiée (Réel)

22 mai 2026

Dernière mise à jour soumise répondant aux critères de contrôle qualité

19 mai 2026

Dernière vérification

1 mai 2026

Plus d'information

Termes liés à cette étude

Plan pour les données individuelles des participants (IPD)

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OUI

Description du régime IPD

Anonymized IPD that underlie results in a publication may be shared upon reasonable scientific request following publication of study results.

Délai de partage IPD

IPD available after publication of primary results

Critères d'accès au partage IPD

Requests must be made by qualified researchers for scientific purposes. Data will be shared under controlled access agreement ensuring privacy and ethical standards.

Type d'informations de prise en charge du partage d'IPD

  • PROTOCOLE D'ÉTUDE
  • SÈVE

Informations sur les médicaments et les dispositifs, documents d'étude

Étudie un produit pharmaceutique réglementé par la FDA américaine

Non

Étudie un produit d'appareil réglementé par la FDA américaine

Non

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