Altruistic Decisions
Study on the Parameters That Influence Perceptual Decisions
Studienübersicht
Status
Status
Bedingungen
Bedingungen
Intervention / Behandlung
Intervention / Behandlung
Studientyp
Studientyp
Einschreibung (Tatsächlich)
Einschreibung
Phase
Phase
- Unzutreffend
Kontakte und Standorte
Studienorte
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Bron, Frankreich, 69677
- CH Le Vinatier
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Teilnahmekriterien
Zulassungskriterien
Zulassungskriterien
Studienberechtigtes Alter
Akzeptiert gesunde Freiwillige
Studienberechtigte Geschlechter
Beschreibung
Inclusion Criteria:
- Aged between 18 and 35
- Right-handed
- French
- Normal vision or corrected by contact lenses
Exclusion Criteria:
- Contraindications to the MEG examination
- Presence of a perceptual disorder (vision) or motor impairing the capacity to carry out the tasks requested (including dyschromatopsia and achromatopsia).
- Taking of medical treatment in progress (excluding contraceptive pill).
- Known neurological or psychiatric history or disorders.
- Participants in an exclusion period for any other research.
- Participants who do not benefit from social protection.
- Participants refusing to be informed of the results of the medical examination.
- Participants who refuse to be informed of the possible detection of an anomaly.
- Participants with MRI contraindications
Studienplan
Wie ist die Studie aufgebaut?
Designdetails
- Hauptzweck: Grundlegende Wissenschaft
- Zuteilung: Nicht randomisiert
- Interventionsmodell: Parallele Zuordnung
- Maskierung: Keine (Offenes Etikett)
Anzahl der Arme
Waffen und Interventionen
Teilnehmergruppe / ArmTeilnehmergruppe / Arm |
Intervention / BehandlungIntervention / Behandlung |
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Sonstiges: Vicarious reward
If a decision influences the well-being of another (through monetary payoff), the decision making processes should differ from a decision that would influences only oneself. The difference will be reflected in the reaction-times and in the accuracy of the response to the task. The drift diffusion models care then used to estimate le decision parameter in each condition and understand which parameter is influenced by the beneficiary of the payoff associated with a decision. Once the decision parameter characterized with behavioral experiment, the study aims to better understand the neural network sustaining the influence of others on the decision making process, by assessing the neural activity related to the decision making processes. Also, the research compares how the brain responses for payoff for others and payoffs for oneself, specially to confirm that these responses are located in different areas of the Anterior cingulate Cortex. |
Random-dots tasks: dots appear and move, most have a random trajectory but a given proportion of them move coherently to the same direction.
Both behavioral task (audience effect and vicarious reward) will be studied in fMRI (functional Magnetic Resonance Imagery). The same paradigms used in the behavioral experiment will be adapted for fMRI. Audience Effect experiment: trials will last for 10 seconds maximum. With 80 trials for each condition (public easy, public difficult, private easy and private difficult), the task will count a total of 320 trials and have a 54 minutes duration, in 3 runs of 17 minutes each. Vicarious Reward experiment: trials will have a 10 seconds maximum duration. Using 40 trials for each condition (other low payoff, other high payoff, self low payoff, self high payoff, control condition), the task will have a total of 200 trials and last for 54 minutes, in 6 runs of 9 minutes each. Both behavioral task (audience effect and vicarious reward) will be studied in MEG (MagnetoEncephaloGraphy). The same paradigms used in the behavioral experiment will be used in MEG. Audience Effect experiment: trials will last for 7 seconds maximum. With 100 trials for each condition (public easy, public difficult, private easy and private difficult), the task will count a total of 400 trials and have a 47 minutes duration. Every 100 trials (about 12 minutes of tasks), a break will be proposed to the participants. Vicarious Reward experiment: trials will have a 7.2 seconds maximum duration. Using 75 trials for each condition (other low payoff, other high payoff, self low payoff, self high payoff, control condition), the task will have a total of 375 trials and last for 45 minutes. Every 125 trials (every 15 minutes), a break will be proposed to the participants. |
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Sonstiges: Audience effect
In order to clarify the complex changes in the decision-making processes induced by simple observation by others (audience) , the experiment have two levels of difficulty .
These levels of difficulty will be determined in such a way as to achieve better 'public' performance than 'private' when the task is easy (high level of consistency) and poor performance when the task is difficult (low level of coherence) As described in the literature in psychology.
Drift diffusion models will be used to better understand the variations in performance, to decipher between a modulation of the diffusion velocity and or of the decision threshold.
This study will help characterize how observation by others modulates performance.
Once the decision parameter characterized with behavioral experiment, the study aims to better understand the neural network sustaining the impact of observation by others on the decision making process.
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Random-dots tasks: dots appear and move, most have a random trajectory but a given proportion of them move coherently to the same direction.
Both behavioral task (audience effect and vicarious reward) will be studied in fMRI (functional Magnetic Resonance Imagery). The same paradigms used in the behavioral experiment will be adapted for fMRI. Audience Effect experiment: trials will last for 10 seconds maximum. With 80 trials for each condition (public easy, public difficult, private easy and private difficult), the task will count a total of 320 trials and have a 54 minutes duration, in 3 runs of 17 minutes each. Vicarious Reward experiment: trials will have a 10 seconds maximum duration. Using 40 trials for each condition (other low payoff, other high payoff, self low payoff, self high payoff, control condition), the task will have a total of 200 trials and last for 54 minutes, in 6 runs of 9 minutes each. Both behavioral task (audience effect and vicarious reward) will be studied in MEG (MagnetoEncephaloGraphy). The same paradigms used in the behavioral experiment will be used in MEG. Audience Effect experiment: trials will last for 7 seconds maximum. With 100 trials for each condition (public easy, public difficult, private easy and private difficult), the task will count a total of 400 trials and have a 47 minutes duration. Every 100 trials (about 12 minutes of tasks), a break will be proposed to the participants. Vicarious Reward experiment: trials will have a 7.2 seconds maximum duration. Using 75 trials for each condition (other low payoff, other high payoff, self low payoff, self high payoff, control condition), the task will have a total of 375 trials and last for 45 minutes. Every 125 trials (every 15 minutes), a break will be proposed to the participants. |
Was misst die Studie?
Primäre Ergebnismessungen
Primäre Ergebnismessungen
Ergebnis Maßnahme |
Maßnahmenbeschreibung |
Zeitfenster |
|---|---|---|
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Modulation of the decisional parameter by the payoff conditions
Zeitfenster: 1 hour
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behavioral data (reaction-times and accuracy) are collected and the decision parameter can be estimated from them using Drift Diffusion Models
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1 hour
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Modulation of the decisional parameter by the beneficiary conditions
Zeitfenster: 1 hour
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behavioral data (reaction-times and accuracy) are collected and the decision parameter can be estimated from them using Drift Diffusion Models
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1 hour
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Sekundäre Ergebnismessungen
Sekundäre Ergebnismessungen
Ergebnis Maßnahme |
Maßnahmenbeschreibung |
Zeitfenster |
|---|---|---|
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Event-Related potentials
Zeitfenster: 1 hour
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study of the time-locked brain activity
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1 hour
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Time-frequency brain responses
Zeitfenster: 1 hour
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study of the oscillatory activity elicited in the brain
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1 hour
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BOLD
Zeitfenster: 1 hour
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Variation of the blood-oxygen-level dependent (BOLD) signal
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1 hour
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Mitarbeiter und Ermittler
Sponsor
Sponsor
Ermittler
Ermittler
- Hauptermittler: Caroline DEMILY, MD, CH Le Vinatier
Studienaufzeichnungsdaten
Haupttermine studieren
Studienbeginn (Tatsächlich)
Studienbeginn
Primärer Abschluss (Tatsächlich)
Primärer Abschluss
Studienabschluss (Tatsächlich)
Studienabschluss
Studienanmeldedaten
Zuerst eingereicht
Zuerst eingereicht
Zuerst eingereicht, das die QC-Kriterien erfüllt hat
Zuerst eingereicht, das die QC-Kriterien erfüllt hat
Zuerst gepostet (Tatsächlich)
Zuerst gepostet
Studienaufzeichnungsaktualisierungen
Letztes Update gepostet (Tatsächlich)
Letztes Update gepostet
Letztes eingereichtes Update, das die QC-Kriterien erfüllt
Letztes eingereichtes Update, das die QC-Kriterien erfüllt
Zuletzt verifiziert
Zuletzt verifiziert
Mehr Informationen
Begriffe im Zusammenhang mit dieser Studie
Schlüsselwörter
Andere Studien-ID-Nummern
Andere Studien-ID-Nummern
- 69HCL16_0680
Arzneimittel- und Geräteinformationen, Studienunterlagen
Studiert ein von der US-amerikanischen FDA reguliertes Arzneimittelprodukt
Studiert ein von der US-amerikanischen FDA reguliertes Geräteprodukt
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