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The Effects of Losartan on Reward Reinforcement Learning

21. oktober 2020 opdateret af: Benjamin Becker, University of Electronic Science and Technology of China

The Role of the Renin-angiotensin System in Reward Reinforcement Learning

This study aims to investigate whether a single dose of losartan (50 mg) can affect learning from positive and negative outcomes and its related neural mechanisms.

Studieoversigt

Status

Ukendt

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

Emerging evidence suggests that the renin-angiotensin system can impact dopamine (DA) transmission and its modulatory role in reward processing. For instance, recent animal models have found that the angiotensin antagonist losartan reduces rewarding effects of methamphetamine and nicotine by modulating DA release in the striatum.The present study thus will investigate losartan effects on reward reinforcement learning and the underlying neural mechanisms. In a double-blind, between-subject, placebo-controlled design, 60 healthy male subjects will be randomly assigned to receive single-dose losartan (50 mg) or placebo, 90 minutes before performing a probabilistic reinforcement learning task during fMRI.

Undersøgelsestype

Interventionel

Tilmelding (Forventet)

60

Fase

  • Ikke anvendelig

Kontakter og lokationer

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

Studiesteder

  • Kina
    • Sichuan
      • Chengdu, Sichuan, Kina, 611731
        • Rekruttering
        • University of Electronic Science and Technology of China
        • Kontakt:

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 30 år (Voksen)

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Han

Beskrivelse

Inclusion Criteria:

  • Healthy subjects without past or current psychiatric or neurological disorders
  • Right-handedness
  • Normal or corrected-normal version

Exclusion Criteria:

  • History of head injury
  • Medical or psychiatric illness
  • Hypertension
  • General cardio-vascular alteration or diseases
  • Allergy against medications
  • Visual or motor impairments
  • Claustrophobia
  • Drug addiction
  • Nicotine dependence
  • FMRI contradictions

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: Parallel tildeling
  • Maskning: Dobbelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: Losartan gruppe
Lægemiddel: Losartan
Medicin: Losartan
administration of losartan (50 mg) (oral)
Andre navne:
  • Cozaar Oral Tablet
Placebo komparator: Placebo gruppe
Lægemiddel: Placebo oral tablet
Medicin: Placebo oral tablet
administration of placebo (oral)

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
BOLD-level activity as assessed by fMRI during the learning phase
Tidsramme: 90 minutes to 110 minutes after treatment
During the paradigm subjects will learn the reward properties of stimuli via the presentation of trial-wise feedback. The neural activation during the prediction of positive and negative outcome feedback will be assessed by functional magnetic resonance imaging (fMRI), particularly in prefrontal and subcortical regions. The effects of treatment will be determined by comparing the losartan- and placebo-treated groups.
90 minutes to 110 minutes after treatment
BOLD-level activity as assessed by fMRI during the learning transfer phase
Tidsramme: 111 minutes to 120 minutes after treatment
Following the initial learning phase subjects learning transfer will be examined by asking subjects to choose between stimuli with high versus low reward probabilities. The neural activation during correct responses will be assessed by functional magnetic resonance imaging (fMRI), particularly in prefrontal and subcortical regions. The effects of treatment will be determined by comparing the losartan- and placebo-treated groups.
111 minutes to 120 minutes after treatment

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Choice accuracy for the stimulus with the high reward probability during the learning phase
Tidsramme: 90 minutes to 110 minutes after treatment
During the learning phase accuracies (in percent) for choosing the stimulus with the highest reward probability will be computed. Effects of treatment on choice accuracy in the probabilistic learning task will be examined by comparing accuracies (percent) between the losartan- and placebo-treated group.
90 minutes to 110 minutes after treatment
Learning rate for positive and negative outcomes
Tidsramme: 90 minutes to 110 minutes after treatment
The learning rate will be determined by performing computational modelling. The learning rate index for positive and negative outcomes during the learning phase will be compared between the losartan- and placebo-treated group.
90 minutes to 110 minutes after treatment
Choice accuracy during the learning transfer phase
Tidsramme: 111 minutes to 120 minutes after treatment
Following the initial learning phase subjects learning transfer will be examined by asking subjects to choose between stimuli with high versus low reward probabilities. For the transfer phase the choice accuracy for selecting stimuli with the highest reward probability and avoiding stimuli with the lowest reward probability will be computed. The effects of treatment will be determined by comparing the accuracy between the losartan- and placebo-treated groups.
111 minutes to 120 minutes after treatment

Samarbejdspartnere og efterforskere

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

Sponsor

University of Electronic Science and Technology of China

Efterforskere

  • Ledende efterforsker: Benjamin Becker, PhD, University of Electronic Science and Technology of China

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)

10. oktober 2020

Primær færdiggørelse (Forventet)

31. december 2021

Studieafslutning (Forventet)

31. marts 2022

Datoer for studieregistrering

Først indsendt

9. oktober 2020

Først indsendt, der opfyldte QC-kriterier

21. oktober 2020

Først opslået (Faktiske)

27. oktober 2020

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

27. oktober 2020

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

21. oktober 2020

Sidst verificeret

1. oktober 2020

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • UESTC-neuSCAN-75

Plan for individuelle deltagerdata (IPD)

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Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .

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