View clinical trials related to fMRI.
Filter by:The study aimed to examine the efficacy and safety of tVNS as a complementary approach for NT1 by conducting a double-blind, randomized, sham-controlled trial. The specific objectives of the study were as follows: To evaluate the effects of complementary tVNS on the ability to maintain wakefulness, severity of narcolepsy, mood and quality of life in patients with NT1
The goal of this observational study is to identify the characteristics of brain functional connectivity in refractory constipation and fluoxetine-sensitive patients. The main questions it aims to answer are: - Investigating the alterations in brain functional connectivity in patients with refractory constipation and fluoxetine-sensitive patients - Assessing the predictive value of brain functional connectivity regarding the efficacy of fluoxetine and standard protocol treatments for constipation. Participants will receive: - Standard physiological and psychological assessments of constipation - BOLD-fMRI tests - Standard protocol and fluoxetine treatment If there is a comparison group: Researchers will compare: Refractory group/Fluoxetine sensitive group to see the specific brain alterations.
Assess the impact of a remote, app-delivered digital meditation intervention on emotional well-being of lonely older adults. Neuroimaging and autonomic physiology will be used to assess the neural correlates of the intervention.
The cognitive trajectory varies among non-demented older adults. In a 12-year follow-up study, we found approximately 5% participants presented rapid cognitive decline. Cardiovascular diseases increased the risk of cognitive decline. However, the influence of cardiovascular risk factors on cognitive decline remained inconsistent. Besides, the potential mechanism of the cardiovascular risk factors and cognitive function has not been fully investigated. Therefore, the proposed program will include two sub-studies. The first sub-study will use the longitudinal data from the Chinese Longitudinal Healthy Longevity Survey to evaluate the influence of cardiovascular risk factors on the trajectories of cognitive function. The second sub-study will recruit cognitive intact older adults with different levels of cardiovascular risk factors. The association among cardiovascular risk factors, cerebral blood flow, brain functional connectivity and cognitive function will be investigated with structural equation modeling. The findings of the proposed program will provide novel insight on preventing cognitive decline from the angle of maintaining healthy vascular function, and will provide evidence in elucidating the potential neurovascular mechanism between cardiovascular risk factors and cognitive function.
Transcutaneous vagal nerve stimulation (tVNS) has been applied to a number of disease areas including visceral pain, depression, cluster headache and Alzheimer's disease. However, there is marked heterogeneity in these studies pertaining to i) the anatomical site of stimulation (neck, inner concha or tragus of ear), and ii) the waveform parameters of the stimulating impulse. This exploratory cross-sectional study will address these knowledge gaps by comparative functional neuroimaging of the neural correlates of tVNS with disparate anatomical sites and electrical waveform characteristics during rest in healthy participants.
The main objective of this project is: 1. To assess the impact of COVID-19 on the brain and executive functioning. Twenty adult subjects of UZ Brussels (volunteers), who needed intensive care due to COVID-19 (n=10) or exhibited mild symptoms due to COVID-19 (n=10), will be recruited after hospital discharge. After signing an informed consent the subjects will undergo brain scans (T1, DTI, SWI, DWI, FLAIR MRI and rsfMRI), an emotion regulation task and a neurocognitive test battery. The latter test battery will be performed using an iPad and will test different neurocognitive functions such as memory, abstract thinking, spatial orientation and attention. The duration of the test battery is 18min. The total duration of one trial is estimated at one hour and a half. All tests are planned at the department of Radiology-Magnetic Resonance (UZ Brussel). After three months patients will visit the department of Radiology-Magnetic Resonance a second time for the same experimental trial. Additionally, a matched control group (n = 20; non covid or ICU patients) will be included and undergo the same tests in order to compare the results of the brain scans, emotional regulation task and neurocognitive test battery with results of both Covid-groups. Next to objective data, questionnaires will be filled out, i.e. visual analogue scales of mental and physical fatigue, Profile of Mood States and some additional return to work questions.
People utilize two behavioral strategies, goal-directed and habitual, when engaging in value-based decision-making that involves rewarding or punishing outcomes. Accumulating evidence suggests an imbalance between habitual and goal-directed behavior in favor of habitual control in parallel with exaggerated tendency toward compulsive/harm avoidance behavior in OCD. In healthy subjects, an arbitration mechanism has been proposed recently that controls the balance between those two strategies of action selection. Arbitration regions regulate the goal-directed/habitual decision-making balance by selectively downregulating the activity of the habitual regions. This project aims to explore the neurobehavioral characteristics of arbitration mechanism and its relationship with behaviors and clinical phenotypes in OCD by applying computational cognitive neuroscience, clinical task-based functional magnetic resonance imaging (fMRI) and transcranial direct current stimulation (tDCS) method.
This study was designed as randomized double blind placebo study to investigate the efficacy of Erinacine A-enriched Hericium erinaceus mycelia for improvement of recognition, vision, and functional MRI alterations.
The proposed research will follow healthy weight children who vary by family risk for obesity to identify the neurobiological and appetitive traits that are implicated in overeating and weight gain during the critical pre-adolescent period. The investigator's central hypothesis is that increased intake from large portions of energy dense foods is due in part to reduced activity in brain regions implicated in inhibitory control and decision making, combined with increased activity in reward processing pathways. To test this hypothesis, the investigators will recruit 120 healthy weight children, aged 7-8 years, at two levels of obesity risk (i.e., 60 high-risk and 60 low-risk) based on parent weight status. This will result in 240 participants: 120 children and their parents.
This is a single, un-replicated visit to the Children's Metabolic Kitchen and Eating Behavior Lab designed to gather data on children's responses to images used in MRI studies. Additionally, a demographic questionnaire for parents will be piloted.