Causal Evidence for Task Regulation by Anterior Cingulate Cortex

NCT ID: NCT04650425

Last Updated: 2023-12-05

Basic Information

• Recruitment Status: RECRUITING
• Clinical Phase: NA
• Total Enrollment: 200 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2021-04-29
• Study Completion Date: 2024-09-30

Brief Summary

The exact function of the anterior cingulate cortex (ACC) is one of the largest riddles in cognitive neuroscience and a major challenge in mental health research. ACC dysfunction contributes to a broad spectrum of neurological and psychiatric disorders, such as depression, ADHD, Parkinson's disease, OCD and many others, but nobody knows what it actually does. Recently a new theory has been developed about ACC function; the HRL-ACC (Hierarchical Reinforcement Learning Theory of ACC). This theory proposes that the ACC selects and motivates high-level tasks based on the principles of hierarchical reinforcement learning. The ACC associates values with tasks (these values are based on the reward positivity produced by the midbrain dopamine system), selects the correct tasks and applies control over other neural networks (such as the dorsolateral prefrontal cortex and basal ganglia), which execute the tasks. The goal of this study is to investigate the consequences of ACC damage (and other areas of the frontal lobe) on task regulation within a group of patients who have suffered a stroke in the frontal lobe. Furthermore, the correlation between ACC damage and mood disorders such as depression and apathy is going to be investigated.

Detailed Description

This is a monocentric prospective interventional clinical trial that will include patients with a stroke in the frontal lobe. Depending on the recruitment manner, participants will undergo one or two sessions of cognitive experiments. The patients will be recruited in two ways, through the Stroke unit and through the outpatient clinic:

1. If a patient with an acute stroke in the frontal lobe is admitted to the Stroke unit and is eligible for this study, the patient will be asked if he is willing to participate. After giving informed consent, the first session will take place once the patient has been transferred to a regular neurological ward. After discharge, a second session will take place 6 to 12 months later at the outpatient clinic, preferably combined with a consultation (as part of the standard of care of stroke patients).

2. Patients who have had a stroke are followed at the outpatient clinic. Patients who are eligible for this study, will be contacted by the treating stroke supervisor during their consultation (either Prof. Veerle De Herdt or Dr. Dimitri Hemelsoet). If they are willing to participate, the first session will take place either right after the consultation at the outpatient clinic, or - if the patient is not available at that time - a new appointment will be made.

One experimental session consists of the following steps:

• Clinical neurological examination with determining of NIHSS score.
• First cognitive task: the coffee-tea task. During this task, a sequence of 7 images is shown and each image contains three objects. The patient has to choose the right objects to make either coffee or tea. At the end of each sequence they get feedback if they have prepared the beverage correctly or not.
• Short break with positioning of 21 EEG electrodes.
• Second task: the virtual T-maze task with video-EEG recording. During this task, a virtual T-maze is shown and the patient has to choose at each junction whether they go left or right. Depending on which direction they choose, they either get positive or negative feedback. This task is known to elicit the reward positivity. During this task, video-EEG will be recorded and this EEG-data will later on be analysed using ERP analysis.
• If second session, administering of questionnaires: Oxford Cognitive Screen, Becker Depression Inventory, DEX apathy questionnaire.

Furthermore, the investigators are going to use voxel-based lesion symptom mapping to analyze the relationship between tissue damage and behavioural problems and reward positivity amplitude.

It is expected that the coffee-tea task will be more difficult for patients with ACC damage compared to patients with lesions in other areas of the frontal lobe. Also, the amplitude of the ERP signals during the virtual T-maze task will be smaller in patients with ACC damage. Furthermore, the investigators expect to find a connection between ACC damage and mood disorders.

Conditions

Stroke

Keywords

Anterior Cingulate Cortex

Study Design

• Allocation Method: NA
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: BASIC_SCIENCE
• Blinding Strategy: NONE

Study Groups

Intervention group

Each participant will undergo one or two sessions, consisting of cognitive tasks, video-EEG recording and administering of questionnaires.

Group Type: EXPERIMENTAL

Cognitive tasks

Intervention Type: BEHAVIORAL

Patients will perform the coffee-tea task and the virtual T-maze task, both in the acute and chronic phase after stroke.

Interventions

Cognitive tasks

Patients will perform the coffee-tea task and the virtual T-maze task, both in the acute and chronic phase after stroke.

Intervention Type: BEHAVIORAL

Eligibility Criteria

Inclusion Criteria

• Stroke patients: ischemic stroke or intracranial hemorrhage
• Involvement of the frontal lobe
• Lesion is visible on CT and/or MRI and is concordant with clinical presentation during the time of onset
• Patients have to be able to give informed consent themselves

Exclusion Criteria

• Patients with a TIA, i.e. no visible lesion on CT and/or MRI or symptoms less than 24 hours
• Patients with decreased alertness or disorders of consciousness, which makes it impossible for these patients to participate in the experiments
• Active alcohol and/or drug abuse/addiction
• Patients diagnosed with dementia or another neurodegenerative disease, or severe cognitive and/or psychiatric disorders that make it impossible for these patients to participate in the study
• Patients with severe aphasia (as defined by NIHSS score)

• Minimum Eligible Age: 18 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Neurology

UNKNOWN

Sponsor Role: collaborator

University Hospital, Ghent

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Veerle De Herdt

Role: PRINCIPAL_INVESTIGATOR

University Hospital Ghent, Department of Neurology

Locations

University Hospital, department of neurology

Ghent, , Belgium

Site Status: RECRUITING

Countries

Belgium

Central Contacts

Veerle De Herdt

Role: CONTACT

Phone: +3293326481

Email: veerle.deherdt@uzgent.Be

Facility Contacts

Veerle De Herdt

Role: primary

Other Identifiers

BC-08764

Identifier Type: -

Identifier Source: org_study_id