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This study will investigate whether administration of a single dose of the serotonin receptor subtype 4 (5-HT4) partial agonist prucalopride has effects on emotional processing and non-emotional cognition in healthy volunteers, compared to placebo administration. Using an experimental medicine approach, the effects of prucalopride on cognitive biomarkers of antidepressant action will be characterised. In a double-blind design, participants will be randomised to receive a single dose of either prucalopride (1mg) or placebo. All participants will come for a Screening Visit to ensure their suitability for the study. If they meet study criteria, they will be invited to a Research Visit, where they will receive the study medication and wait for two hours while the drug reaches peak levels. After two hours they will be asked to complete a series of computer-based tasks measuring emotional, non-emotional cognitive processing, and reward processing. The primary study hypothesis is that acute prucalopride administration will have positive effects on processing facial expressions of emotion. Secondary hypotheses are that acute prucalopride administration will affect other measures of emotional processing, and non-emotional cognition.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Prucalopride | Experimental | 1mg prucalopride capsule |
|
| Placebo | Placebo Comparator | Lactose placebo capsule |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Prucalopride | Drug | 1mg prucalopride tablet, encapsulated in white capsule |
|
| Measure | Description | Time Frame |
|---|---|---|
| Recognition of positive and negative facial expressions | Accuracy to identify positive vs. negative facial expressions of emotion on the FERT | Day 1: 2-5 hours post drug administration |
| Measure | Description | Time Frame |
|---|---|---|
| Recall of emotional words | Number of positive and negative words correctly (and incorrectly) recalled in the EREC task | Day 1: 2-5 hours post drug administration |
| Recognition of emotional words |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Susannah E Murphy, DPhil | University of Oxford | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| University of Oxford | Oxford | OX3 7JX | United Kingdom |
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| Label | URL |
|---|---|
| Psychopharmacology and Emotion Research Laboratory | View source |
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| ID | Term |
|---|---|
| D003863 | Depression |
| D003866 | Depressive Disorder |
| D019964 | Mood Disorders |
| D001523 | Mental Disorders |
| ID | Term |
|---|---|
| D001526 | Behavioral Symptoms |
| D001519 | Behavior |
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| ID | Term |
|---|---|
| C406662 | prucalopride |
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Participants will be randomly allocated to one of two groups (prucalopride or placebo). Participants in the prucalopride group will receive 1mg of the drug. Participants in the placebo group will receive a lactose placebo. Note that the study is not assessing the safety or efficacy of prucalopride, rather it is using prucalopride to assess the behavioural and neural effects of 5-HT4 partial agonists.
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| Placebo | Other | Lactose placebo tablet, encapsulated in white capsule |
|
Number of positive and negative words correctly (and incorrectly) recognised in the EMEM task
| Day 1: 2-5 hours post drug administration |
| Attentional vigilance to emotional faces | Attentional vigilance to fearful and happy faces in the FDOT task | Day 1: 2-5 hours post drug administration |
| Recall of words Auditory Verbal Learning Task (AVLT) | Number of items correctly and incorrectly recalled across blocks | Day 1: 2-5 hours post drug administration |
| Reward and loss sensitivity | Proportion of participants on each trial that chose the correct (high probability) symbol in the win condition, and the incorrect (high probability) symbol in the loss condition of the PILT task | Day 1: 2-5 hours post drug administration |
| Working memory performance | Mean accuracy and reaction time on 1-back, 2-back and 3-back conditions compared with 0-back condition on the N-back task | Day 1: 2-5 hours post drug administration |
| Contextual learning | Difference between reaction time and accuracy on novel and repeated arrays in the contextual cueing task | Day 1: 2-5 hours post drug administration |