- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03450291
Eating Concerns and Compulsivity
July 5, 2018 updated by: University of Oxford
Do Individuals in Eating Disorder Risk Groups Learn About the Causal Statistics of the Environment?
This study uses a computational task to examine differences in adaptive learning to both rewards and punishments between three groups: those who have recovered from anorexia nervosa, those who score highly on the EAT-26 (Eating Attitudes Test - 26 item version; an eating disorder symptom scale), and healthy controls.
This task also allows the examination of pupil response (thought to reflect norepinephrine activity) in response to expected and unexpected wins and losses.
Study Overview
Status
Completed
Conditions
Intervention / Treatment
Detailed Description
This study involves using a novel computational task (the volatility task, designed by Dr Michael Browning) to examine differences in adaptive learning in terms of sensitivity to environmental change in those who are in eating disorder 'risk' groups (defined as those with a previous diagnosis of AN, and those who score highly in the EAT-26 for eating disorder symptoms.
This study allows us to investigate whether or not these individuals are able to pick up key environmental statistics and adapt their behaviour accordingly.
We hypothesise that those in eating disorder risk groups will show a deficit in this area, which might begin to explain why the cognitive phenotype of 'cognitive inflexibility' is found so commonly in these patients.
Using pupillometry measures will also allow us to putatively form links between this behaviour and the norepinephrine system in these participants, as pupil dilation measures are thought to track environmental statistics of this kind.
Additionally, this task allows us to identify whether there is a particular deficit in tracking and learning about positive or negative environmental information.
We will be using standard clinical interviews and questionnaires to define the groups and to record key variables (e.g.
mood information) within groups.
This study will consist of a single visit, including these interviews and questionnaires, the volatility task with pupillometry measures, and the Wisconsin Card Sort Task, which we hope to use to demonstrate a baseline difference between groups on cognitive flexibility.
Study Type
Interventional
Enrollment (Actual)
82
Phase
- Not Applicable
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Study Locations
-
-
Oxfordshire
-
Oxford, Oxfordshire, United Kingdom, OX3 7JX
- Department of Psychiatry, University of Oxford
-
-
Participation Criteria
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
Eligibility Criteria
Ages Eligible for Study
18 years to 45 years (Adult)
Accepts Healthy Volunteers
No
Genders Eligible for Study
Female
Description
Inclusion Criteria:
- Participant is willing and able to give informed consent for participation in the study.
- Females aged 18 to 45 years.
- BMI over 18.5 and has remained so for the last year.
- Participant is a fluent English speaker. Inclusion: recovered from anorexia
- Past formal diagnosis of AN (defined by DSM-5 criteria).
- Fully recovered: Score must be below 2.767 on the EDE-Q, below 16 on the CIA, and below 20 on the EAT-26 or partially recovered: scores may be above 2.767, 16 and 20 respectively.
Inclusion: high scoring on EAT-26
- Score above 20 on the EAT-26 questionnaire. Inclusion: healthy control
- Score below 2.767 on the EDE-Q, below 16 on the CIA, and below 20 on the EAT-26.
Exclusion Criteria:
- Any current diagnosis of a psychiatric disorder which in the investigator's opinion could impact study results (e.g. significant depression, anxiety or OCD).
- Any current psychotropic medications.
- Current regular cigarette smoking of over 5 cigarettes per day.
- Recent use of illicit drugs.
- Alcohol intake which indicates an element of alcohol abuse; or unwillingness to refrain from drinking the night before the study visit.
Exclusion for high scoring EAT-26
• A former formal diagnosis of an eating disorder. Note that in this group a current diagnosis of EDNOS will not be an exclusion criterion.
Study Plan
This section provides details of the study plan, including how the study is designed and what the study is measuring.
How is the study designed?
Design Details
- Primary Purpose: Basic Science
- Allocation: Non-Randomized
- Interventional Model: Parallel Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Recovered from anorexia nervosa
Those who have a past diagnosis of AN (defined by the Diagnostic and Statistical Manual of Mental Disorders-5 (DSM-5) criteria) but are currently recovered, as shown by BMI over 18.5 throughout the last 12 months (self-report and current weight measured).
Defined as either 'fully recovered'and: score must be within the 'normal range' of the Eating Disorders Examination Questionnaire (EDE-Q) global mean scores for young women, below 20 on the EAT-26 and below 16 on the Clinical Impairment Assessment for Eating Disorders (CIA); or partially recovered where one or more of these scores may be above the above-mentioned cutoffs.
|
Participants complete a volatility task, with pupillometry; and a Wisconsin Card Sort Task.
|
Experimental: High scoring on the EAT-26
Those who score above 20 on the EAT-26, but who do not declare a former diagnosis of an eating disorder (though they may meet criteria for a current diagnosis during the Structured Clinical Interview for the DSM-5).
|
Participants complete a volatility task, with pupillometry; and a Wisconsin Card Sort Task.
|
Experimental: Healthy controls
No history of or current diagnosis of any psychiatric disorder (especially eating disorders) which could impact study results.
|
Participants complete a volatility task, with pupillometry; and a Wisconsin Card Sort Task.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Difference between eating disorder risk groups and healthy controls in extent to which learning rate difference between win-volatile and loss-volatile blocks changes.
Time Frame: 1 day
|
Difference in relative inverse logit learning rate (alpha) for the volatile versus stable blocks between groups.
|
1 day
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Whether there is a difference in the learning rate for different valence environmental information (positive vs. negative) across groups.
Time Frame: 1 day
|
To compare changes in learning rate across blocks for reward vs. punishment information across groups.
|
1 day
|
Differences in pupil dilation after volatility and surprising events between groups
Time Frame: 1 day
|
Examine whether post-outcome pupil dilation tracks environmental volatility and outcome surprise to the same extent across groups.
|
1 day
|
Correlation between relative log learning rate (alpha) change between blocks and eating disorder symptom scores on the Eating Attitudes Questionnaire - 26 item version
Time Frame: 1 day
|
The EAT-26 is a questionnaire which measures eating disorder symptoms.
The total score will be used (summing of individual items).
Lower scores represent lower presence of eating disorder symptoms.
|
1 day
|
Correlate relative log learning rate and beta size (an inverse temperature parameter) with perseverative errors on the Wisconsin Card Sort task across groups
Time Frame: 1 day
|
1 day
|
Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
Investigators
- Principal Investigator: Philip J Cowen, Prof, University of Oxford
Study record dates
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
Study Major Dates
Study Start (Actual)
August 18, 2017
Primary Completion (Actual)
June 1, 2018
Study Completion (Actual)
June 1, 2018
Study Registration Dates
First Submitted
February 15, 2018
First Submitted That Met QC Criteria
February 22, 2018
First Posted (Actual)
March 1, 2018
Study Record Updates
Last Update Posted (Actual)
July 6, 2018
Last Update Submitted That Met QC Criteria
July 5, 2018
Last Verified
February 1, 2018
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- R51898/RE003
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Undecided
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
No
Studies a U.S. FDA-regulated device product
No
product manufactured in and exported from the U.S.
No
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
Clinical Trials on Eating Disorder
-
University of North Carolina, Chapel HillThe Hilda & Preston Davis Foundation; Global Foundation for Eating DisordersCompletedEating Disorder | Binge-eating DisorderUnited States
-
Sao Jose do Rio Preto Medical SchoolFundação de Amparo à Pesquisa do Estado de São PauloCompletedBinge-Eating Disorder | Eating Disorders | Eating Behavior | Eating Disorder | Binge Eating Disorder Associated With ObesityBrazil
-
Lindner Center of HOPEUniversity of CincinnatiCompleted
-
ShireCompleted
-
Nova Scotia Health AuthorityCompletedBinge-Eating Disorder | Eating DisorderCanada
-
Region of Southern DenmarkUniversity of Southern Denmark; JaschaFondenNot yet recruitingOther Specified Feeding or Eating Disorder | Eating Disorder NosDenmark
-
University Hospital, MontpellierNot yet recruitingEating Disorders | Eating Disorder Binge
-
Nova Scotia Health AuthorityWithdrawnBulimia Nervosa | Eating Disorder | Binge Eating DisorderCanada
-
Marianne Lau, MD, DSci.The Ministry of Science, Technology and Innovation, DenmarkUnknownBulimia Nervosa (BN) | Binge Eating Disorder (BED) | Eating Disorder Not Otherwise Specified (EDNOS)Denmark
-
Oxford Health NHS Foundation TrustCompletedBulimia Nervosa | Binge Eating Disorder | Eating Disorder Not Otherwise SpecifiedUnited Kingdom
Clinical Trials on Volatility task
-
University of Sao PauloCompleted
-
Centre Hospitalier St AnneInstitut du Cerveau et de la Moelle (ICM Institute)UnknownDepression | SchizophreniaFrance
-
Igdir UniversityNot yet recruiting
-
Great Ormond Street Hospital for Children NHS Foundation...University College, LondonNot yet recruitingClinician Perception | Clinician AttentionUnited Kingdom
-
University of California, Los AngelesNational Institute of Neurological Disorders and Stroke (NINDS)RecruitingParkinson DiseaseUnited States
-
University of AmericasActive, not recruitingFragility | Functional Movement DisorderChile
-
Assistance Publique Hopitaux De MarseilleUnknown
-
University of EdinburghCompletedStroke | Anxiety Disorders | Transient Ischemic AttackUnited Kingdom
-
University of Sao PauloCompletedDuchenne Muscular Dystrophy
-
Kessler FoundationNew Jersey Commission on Brain Injury ResearchCompletedBrain Injuries, Traumatic | Traumatic Brain InjuryUnited States