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Improving Visual Attention in Schizophrenia

22. juni 2021 opdateret af: Hans Klein, The University of Texas at Dallas

Improving Visual Attention to Social Stimuli in Individuals With Schizophrenia

This study investigates whether visual attention can be improved in individuals with schizophrenia by stimulating the brain via transcranial Direct Current Stimulation (tDCS).

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

Individuals with schizophrenia tend to display abnormal visual attention when performing visual tasks, typically spending less time on salient features of the stimuli (e.g. core facial features or body movement in social tasks), and instead focusing on idiosyncratic features of an image or video. Poor visual attention in schizophrenia has been directly linked to poorer social cognitive performance (e.g. recognizing emotional expressions or social cues) which can impact an individual's day to day functioning.

Transcranial Direct Current Stimulation (tDCS) is a form of noninvasive neurostimulation which has been proposed as a therapeutic procedure in numerous psychiatric disorders. TDCS in schizophrenia has been demonstrated to improve a wide range of cognitive processes, and in healthy adults, tDCS has been demonstrated to improve aspects of social cognition. TDCS thus appears to be a promising therapeutic technique that may be useful for improving visual attention in patients with schizophrenia, and potentially impact social cognitive performance via an underlying mechanism tying the two. This study will compare visual performance in individuals with schizophrenia across two conditions: active anodal tDCS and sham tDCS, while also comparing between brain stimulation sites: rTPJ and dmPFC.

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

81

Fase

  • Ikke anvendelig

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

    • Texas
      • Richardson, Texas, Forenede Stater, 75080
        • The University of Texas at Dallas

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

18 år til 60 år (Voksen)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion Criteria:

  • DSM-IV-TR or DSM-5 diagnosis of schizophrenia or schizoaffective disorder and clinically stable (i.e. no hospitalizations) for at least 8 weeks prior to informed consent and be on a stable medication regimen for at least 6 weeks with no dose changes for a minimum of 2 weeks prior to informed consent.

Exclusion Criteria:

  • The presence or history of a pervasive developmental disorder or mental retardation as defined by a premorbid IQ < 70
  • Presence or history of medical or neurological disorders in which neural stimulation would be contraindicated (e.g. presence of epilepsy or history of seizures)
  • Presence of sensory limitations, including visual or hearing impairments that interfere with assessment
  • History of electroconvulsive therapy
  • Not proficient in English
  • Presence of substance abuse in the past one month or dependence not in remission in the past six months

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Grundvidenskab
  • Tildeling: Randomiseret
  • Interventionel model: Crossover opgave
  • Maskning: Dobbelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: Anodal followed by sham stimulation tDCS to rTPJ
cross-over design - active stimulation tDCS to the rTPJ followed by behavioral testing. After 1 week washout, sham stimulation tDCS to the rTPJ followed by behavioral testing.
active anodal tDCS with behavioral tasks to assess visual attention
sham tDCS with behavioral tasks to assess visual attention
Aktiv komparator: Anodal followed by sham stimulation tDCS to dmPFC
cross-over design - active stimulation tDCS to the dmPFC followed by behavioral testing. After 1 week washout, sham stimulation tDCS to the dmPFC followed by behavioral testing.
active anodal tDCS with behavioral tasks to assess visual attention
sham tDCS with behavioral tasks to assess visual attention
Eksperimentel: Sham followed by anodal stimulation tDCS to rTPJ
cross-over design - sham stimulation tDCS to the rTPJ followed by behavioral testing. After 1 week delay, active stimulation tDCS to the rTPJ followed by behavioral testing.
active anodal tDCS with behavioral tasks to assess visual attention
sham tDCS with behavioral tasks to assess visual attention
Aktiv komparator: Sham followed by anodal stimulation tDCS to dmPFC
cross-over design - sham stimulation tDCS to the dmPFC followed by behavioral testing. After 1 week delay, active stimulation tDCS to the dmPFC followed by behavioral testing.
active anodal tDCS with behavioral tasks to assess visual attention
sham tDCS with behavioral tasks to assess visual attention

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Visual Attention to Static Faces
Tidsramme: Assessment will be completed 30 minutes after completion of the active/sham stimulation
Visual attention measured via eye-tracking (percentage of time attending to investigator designated AOIs) when viewing static, emotional faces (stimuli: Emotion Recognition - 40). AOIs for static faces will be defined as core facial features (i.e. eyes, nose, mouth).
Assessment will be completed 30 minutes after completion of the active/sham stimulation
Visual Attention to Dynamic Actor
Tidsramme: Assessment will be completed 30 minutes after completion of the active/sham stimulation
Visual attention measured via eye-tracking(percentage of time attending to investigator designated AOIs) when viewing videos of a single actor (stimuli: Bell Lysaker Emotion Recognition Task). AOIs for this task will be defined as core facial features (i.e. eyes, nose, and mouth).
Assessment will be completed 30 minutes after completion of the active/sham stimulation
Visual Attention to Dynamic Social Scenes
Tidsramme: Assessment will be completed 30 minutes after completion of the active/sham stimulation
Visual attention measured via eye-tracking (percentage of time attending to investigator designated AOIs) when viewing videos of two or more actors in a scene (stimuli: The Awareness of Social Inference Task Part 3, Version A). AOIs for this task will be defined as salient social and contextual stimuli (e.g. social stimuli are faces of actors, while contextually salient stimuli include items actors are talking about, such as a plate full of food or an empty wallet).
Assessment will be completed 30 minutes after completion of the active/sham stimulation

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Fixation Stabilization
Tidsramme: Assessment will be completed 30 minutes after completion of the active/sham stimulation
Stabilization of visual fixation on fixation circle positioned in middle of screen. Participants will be placed in front of an eyetracking device and asked to keep their eyes focused on a circle in the middle of the screen. Stabilization will be measured via eye-tracking as the deviation from a single point on screen, calculated by assessing the sum of squares of both the x and y axis (output from eyetracking device). Higher number indicates more movement, and thus less stabilization.
Assessment will be completed 30 minutes after completion of the active/sham stimulation

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Efterforskere

  • Ledende efterforsker: Hans S Klein, MS, University of Texas at Dallas

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Faktiske)

25. marts 2019

Primær færdiggørelse (Faktiske)

4. marts 2020

Studieafslutning (Faktiske)

4. marts 2020

Datoer for studieregistrering

Først indsendt

15. marts 2019

Først indsendt, der opfyldte QC-kriterier

15. marts 2019

Først opslået (Faktiske)

19. marts 2019

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

13. juli 2021

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

22. juni 2021

Sidst verificeret

1. juni 2021

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • 19-58

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

Ingen

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

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Ingen

Studerer et amerikansk FDA-reguleret enhedsprodukt

Ja

produkt fremstillet i og eksporteret fra U.S.A.

Ja

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