- ICH GCP
- Yhdysvaltain kliinisten tutkimusten rekisteri
- Kliininen tutkimus NCT03989518
The Link Between Mental Imagery and the Reduction of Fear in Imaginal Extinction
Tutkimuksen yleiskatsaus
Tila
Ehdot
Yksityiskohtainen kuvaus
The study takes part over three consecutive days, with fear conditioning to visual stimuli on day 1, imaginal extinction on day 2, and a fear reinstatement procedure, again to visual stimuli, on day 3. Skin conductance is used to measure fear responses.
Participants' are randomized to receive conditioning, extinction and reinstatement with either complex or simple stimuli. During imaginal extinction, imagery of each experimental stimulus is prompted through different verbal instructions.
Opintotyyppi
Ilmoittautuminen (Todellinen)
Vaihe
- Ei sovellettavissa
Yhteystiedot ja paikat
Opiskelupaikat
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Uppsala, Ruotsi
- Uppsala University, Departement of Psychology
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Osallistumiskriteerit
Kelpoisuusvaatimukset
Opintokelpoiset iät
Hyväksyy terveitä vapaaehtoisia
Sukupuolet, jotka voivat opiskella
Kuvaus
Inclusion Criteria:
Age 18 or over
Fluent in Swedish
Willing and able to provide informed consent and complete study procedures
Exclusion Criteria:
Current psychiatric disorder
Use of psychotropic medication within 6 months prior to study start
Receiving psychological treatment within 6 months prior to study start
Current neurological condition
Opintosuunnitelma
Miten tutkimus on suunniteltu?
Suunnittelun yksityiskohdat
- Ensisijainen käyttötarkoitus: Perustiede
- Jako: Satunnaistettu
- Inventiomalli: Rinnakkaistehtävä
- Naamiointi: Yksittäinen
Aseet ja interventiot
Osallistujaryhmä / Arm |
Interventio / Hoito |
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Kokeellinen: Simple stimuli
Two perceptually simple stimuli are used during all experimental phases (geometrical figures).
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Day 1. Participants are exposed to two different visual stimuli.
One of these stimuli is paired with a mild electric shock (i.e.
conditioned stimuli).
Day 2 (24 hours after Day 1).
Participants are exposed to mental imagery of the stimuli used during fear conditioning.
Imagery is prompted through different verbal instructions presented in a pseudo-randomized order.
No shocks are delivered.
Prior to imaginal extinction, participants receive task specific training.
Day 3 (48 h after day1).
Participants are exposed to the same stimuli used during fear conditioning (day 1) and imaginal extinction (day 2).
Two unsignaled shocks are delivered at the beginning of the experiment, prior to the presentation of the first visual stimulus.
No further shocks are delivered.
This procedure allows the study of long term effects of imaginal extinction.
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Kokeellinen: Complex stimuli
Two complex stimuli are used in all experimental phases.
Stimuli consist of photographs of real objects of the same size and shape as the simple stimuli, but include perceptually more complex patterns, details and colors.
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Day 1. Participants are exposed to two different visual stimuli.
One of these stimuli is paired with a mild electric shock (i.e.
conditioned stimuli).
Day 2 (24 hours after Day 1).
Participants are exposed to mental imagery of the stimuli used during fear conditioning.
Imagery is prompted through different verbal instructions presented in a pseudo-randomized order.
No shocks are delivered.
Prior to imaginal extinction, participants receive task specific training.
Day 3 (48 h after day1).
Participants are exposed to the same stimuli used during fear conditioning (day 1) and imaginal extinction (day 2).
Two unsignaled shocks are delivered at the beginning of the experiment, prior to the presentation of the first visual stimulus.
No further shocks are delivered.
This procedure allows the study of long term effects of imaginal extinction.
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Mitä tutkimuksessa mitataan?
Ensisijaiset tulostoimenpiteet
Tulosmittaus |
Toimenpiteen kuvaus |
Aikaikkuna |
|---|---|---|
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Skin conductance response (SCR)
Aikaikkuna: Day 1
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SCR is used as a measure of physiological fear responses.
Differences in fear responses are used to assess fear learning during fear acquisition and to explore main effects and interactions between fear learning, stimulus complexity and capacity for mental imagery.
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Day 1
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Skin conductance response (SCR)
Aikaikkuna: Day 2 (24 h after day1)
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SCR is used as a measure of physiological fear responses.Differences in fear responses are used to assess fear reduction during imaginal extinction, and to explore main effects and interactions between fear reduction, stimulus complexity and capacity for mental imagery.
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Day 2 (24 h after day1)
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Skin conductance response (SCR)
Aikaikkuna: Day 3 (48 h after day 1)
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SCR is used as a measure of physiological fear responses.Differences in fear response are used to assess return of fear during reinstatement, and to explore main effects and interactions between return of fear, stimulus complexity and capacity for mental imagery.
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Day 3 (48 h after day 1)
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Toissijaiset tulostoimenpiteet
Tulosmittaus |
Toimenpiteen kuvaus |
Aikaikkuna |
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Fear ratings
Aikaikkuna: Day 1
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Ratings of subjective fear during the experimental procedure.
Scale: 0 -100 (no fear at all - extreme fear)
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Day 1
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State-Trait Anxiety Inventory
Aikaikkuna: Day 1
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This is a self-rated questionnaire measuring trait anxiety.
Higher scores indicate higher level of trait-anxiety (range 20-80)
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Day 1
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Difficulties in emotion regulation scale
Aikaikkuna: Day 1
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This is a self-rated questionnaire measuring difficulties in emotion regulation.
Higher scores indicate higher level of difficulties in emotion regulation (range 36-180)
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Day 1
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Fear ratings
Aikaikkuna: Day 2 (24 h after day 1)
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Ratings of subjective fear during the experimental procedure.
Scale: 0 -100 (no fear at all - extreme fear)
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Day 2 (24 h after day 1)
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Vividness of mental imagery during imaginal extinction
Aikaikkuna: Day 2 (24 h after day 1)
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Scale: 1-5; no image at all - image as clear and vivid as real life
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Day 2 (24 h after day 1)
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The Plymouth Sensory Imagery Questionnaire
Aikaikkuna: Day 2 (24 h after day 1)
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This is a self-rated questionnaire measuring vividness of mental imagery across different sensory modalities.
Higher scores indicate higher level of vividness.
(range 0-70)
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Day 2 (24 h after day 1)
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The Vividness of Visual Imagery Questionnaire
Aikaikkuna: Day 2 (24 h after day 1)
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This is a self-rated questionnaire measuring vividness of visual mental imagery.
Only eyes open section is administered.
Higher scores indicate higher level of vividness (range 0-80)
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Day 2 (24 h after day 1)
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Spontaneous use of imagery scale
Aikaikkuna: Day 2 (24 h after day 1)
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This is a self-rated questionnaire measuring spontaneous use of imagery.
Higher scores higher levels use of spontaneous use of imagery (range 12- 60)
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Day 2 (24 h after day 1)
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Expectancy ratings
Aikaikkuna: Day 2 (24 h after day 1)
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After the imaginal extinction procedure, participants are asked to rate to what extent they believed that electric shocks would be delivered during the procedure on a scale ranging from 0 - 100 %
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Day 2 (24 h after day 1)
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Fear ratings
Aikaikkuna: Day 3 (48 h after day 1)
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Ratings of subjective fear during the experimental procedure.
Scale: 0 -100 (no fear at all - extreme fear)
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Day 3 (48 h after day 1)
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Expectancy ratings
Aikaikkuna: Day 3 (48 h after day 1)
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After the reinstatement procedure, participants are asked to rate to what extent they believed that electric shocks would be delivered during the procedure on a scale ranging from 0 - 100 %
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Day 3 (48 h after day 1)
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Muut tulostoimenpiteet
Tulosmittaus |
Toimenpiteen kuvaus |
Aikaikkuna |
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Task compliance
Aikaikkuna: Day 1
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Questions asking participants to rate to what extent they followed the instructions during the experimental procedure on a scale ranging from 0 - 100 %.
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Day 1
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Task compliance
Aikaikkuna: Day 2 (24 h after day 1)
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Questions asking participants to rate to what extent they followed the instructions during the experimental procedure on a scale ranging from 0 - 100 %.
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Day 2 (24 h after day 1)
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Task compliance
Aikaikkuna: Day 3 (48 h after day 1)
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Questions asking participants to rate to what extent they followed the instructions during the experimental procedure on a scale ranging from 0 - 100 %.
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Day 3 (48 h after day 1)
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Yhteistyökumppanit ja tutkijat
Sponsori
Julkaisuja ja hyödyllisiä linkkejä
Opintojen ennätyspäivät
Opi tärkeimmät päivämäärät
Opiskelun aloitus (Todellinen)
Ensisijainen valmistuminen (Todellinen)
Opintojen valmistuminen (Todellinen)
Opintoihin ilmoittautumispäivät
Ensimmäinen lähetetty
Ensimmäinen toimitettu, joka täytti QC-kriteerit
Ensimmäinen Lähetetty (Todellinen)
Tutkimustietojen päivitykset
Viimeisin päivitys julkaistu (Todellinen)
Viimeisin lähetetty päivitys, joka täytti QC-kriteerit
Viimeksi vahvistettu
Lisää tietoa
Tähän tutkimukseen liittyvät termit
Muut tutkimustunnusnumerot
- 2019-00524
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