Clinical Trials About "Pattern stressor evoked brain activity predict reactivity" RSS

20:44 EDT 20th June 2018 | BioPortfolio

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Showing "Pattern stressor evoked brain activity predict reactivity" Clinical Trials 1–25 of 15,000+


Cerebrovascular Reactivity in American Football Players

Investigators will measure cerebrovascular reactivity (CVR) using functional near-infrared spectroscopy (fNIRS) and magnetic resonance imaging (MRI) during the chronic phase after repetitive mild traumatic brain injury (rmTBI) as a biomarker of traumatic cerebrovascular injury (TCVI). We hypothesize that CVR will be decreased in patients with rmTBI and that these decreases will correlate with clinical outcomes. Furthermore, we predict that 5 week administration of a phosphodies...

Management of Glaucoma w/ SLT or Trabecular Stent Bypass Microsurgery Using the Diopsys VEP/PERG Protocols

The purpose of this study is to establish electrophysiological benchmarks, using the Diopsys Visual Evoked Potential/ Pattern Electroretinogram (VEP/PERG) protocols of populations with Glaucoma before and after either Selective Laser Trabeculoplasty (SLT) or Trabecular Stent Bypass Microsurgery.

Men Undergoing Radical Prostatectomy

The purpose of this study is to see if the protein pattern in your blood can predict whether or not your prostate tumor is aggressive. We will use a new and very sensitive technique, called mass spectroscopy, to measure hundreds of pieces of protein in your blood. A computer will make a picture of the protein pattern. We will do this in 500 men before their prostate surgery and see if there is a pattern that predicts what the tumor looks like under the microscope. We will also ...

Gustatory Evoked-related Potentials in Humans

Taste perception plays an important role in maintaining nutritional balance. Gustatory evoked potentials (GEP) can be detected in response to an intermittent stimulation of the gustatory receptors by a primary flavour. GEP are non invaisve, painless and safe. The aims were to establish a reliable recording of GEP in Humans and to determine physiological variations of the gustatory evoked cerebral activity, by recording gustatory evoked potentials in different physiological sit...

Brain Activity During Production of Movement

This study will use electroencephalography (EEG) to examine how the brain prepares for movement. It will look at 1) what changes occur in a person's brain just before voluntary movement, 2) when the changes occur, 3) how consistent the changes are, and 4) how the changes vary from person to person. The information from this study will be applied to other studies, such as exploring how brain changes that signal movement can be used to control prostheses in patients with spinal c...

AERs in Aphasia: Severity and Improvement

Over one million persons in the United States are aphasic subsequent to a stroke. Most of the individuals improve through spontaneous recovery and treatment. However, there are no precise methods for predicting which patients will improve and, for those who do, how much improvement will occur. There is a need to improve prognostic precision in aphasia. The purpose of this investigation is to test the precision of auditory evoked responses (AERs) to provide a prognosis for im...

Non-invasive Measurement of Cerebrovascular Reactivity After Traumatic Brain Injury

The investigators will longitudinally measure cerebrovascular reactivity (CVR) by functional near-infrared spectroscopy (fNIRS) in acute (≤3 days from injury), subacute, and chronic phases after TBI as a biomarker of TCVI as compared to healthy controls. CVR will be measured by fNIRS response to hypercapnia. The investigators hypothesize that CVR will be decreased after TBI and that these decreases will correlate with clinical outcomes. Furthermore, the investigators predict ...

Evoked Fields After Median and Ulnar Stimulation

In order to be able to study the effects of evoked fields with magnetoencephalography (MEG) in two groups of patients, comparison is made with a group of healthy volunteers.

Repurposing alpha1 Noradrenergic Antagonists for Alcoholism Treatment

Double-blind, placebo-controlled, cross-over design study examining the effects of a norepinephrine alpha1 receptor antagonist (prazosin) on stress reactivity in a laboratory stressor task.

Imaging Antidepressant vs. Cognitive Behavior Therapy Effects on Unipolar Depression

Our goals are 1) to use functional magnetic resonance imaging (fMRI) to predict which depressed individuals will respond to different validated treatments for unipolar depression including Cognitive Therapy (CT) and antidepressant medications (selective serotonin reuptake inhibitors; SSRIs) and 2) to understand whether CT and SSRIs affect similar aspects of brain function underlying cognition and emotion. Thus, we will examine depressed adults ages 18-55 using fMRI during cogn...

Vestibular Evoked Myogenic Potential: A New Device Propose

The bioelectrical responses of muscle, evoked by sound, obtained with a device considered the gold standard (widely used in clinics and hospitals) are similar to those obtained with a new device developed

Brain Network Activation and Gait and Posture in FXTAS

In this study we aim to identify and characterize a potential neurophysiological biomarker by mapping functional networks of brain activity (Brain Network Activation, BNA) based on analysis of evoked response potential (ERP) signals in both asymptomatic FMR1 premutation carriers and in patients with various stages of FXTAS. Additionally correlations will be studied between these BNA scores and demographics (gender, age and disease duration) as well as genetic mutation and clini...

Recollection Training in Healthy Older Adults and Older Adults With Amnestic Mild Cognitive Impairment

We have developed a training intervention that successfully improves older adults' memory. We have also shown that older adults whose memory is as good as younger adults' memory (Hi-Old) use an altered pattern of memory-related brain activity compared to younger adults, whereas healthy older adults with poorer memory (Lo-Old) do not. We have also shown that individuals with amnestic Mild Cognitive Impairment (aMCI) have impairments of conscious, effortful, Recollection-based me...

Combined Intracerebral and Jugular Bulb Microdialysis

The first aim of this study is to investigate the frequency and severity of a specific pathological metabolic pattern, mitochondrial dysfunction, of the brain in comatose patients under neurocritical care. This pattern is recognized as a complication after compromised blood flow to the brain and may be amenable to treatment. The other main aim of this study is to correlate patterns of metabolites between brain and jugular venous blood. It is probable but not proven that jugular...

Comparing SD-tVEP and PERG Tests Between Patients With Glaucoma, Patients With High Eye Pressure and "Normal" Patients

Wills Eye Hospital Glaucoma Research Center will conduct a 1-year prospective study to assess the ability of a Short Duration Transient Visual Evoked Potential (SD- tVEP) and a Steady-State Pattern electro-retinogram (PERG) vision testing system to detect visual dysfunction in patients with ocular hypertension. The study aims to assess the reversibility of retinal ganglion cell (RGC) dysfunction after administering intraocular pressure (IOP) lowering treatment. The investigator...

Evaluation of the Global Auditory Nerve Activity for Exploration of Hearing in Humans

To date, all the electrophysiological methods for auditory testing rely on the measure on synchronous evoked auditory nerve activity. This measure only takes into account the response of the first action potential in every auditory fibber, but provides no information about the neural response during a sustained activity. This can explain why in experimental models, a loss of more of 80% of auditory nerve fibbers cannot be detected by usual electrophysiological measurements. In ...

Brain Activation During Thermal Stimulation in Neuropathic Pain

Patients with peripheral neuropathy frequently exhibit treatment-refractory neuropathic pain. Although both peripheral and central determinants are recognized for the pathophysiological basis of neuropathic pain following peripheral injury, the modulating effect on pain processing in brain by peripheral mechanisms remains elusive. Here, we will systematically compare the sensory symptoms and brain activation to painful heat stimulation applied to the foot dorsum between patient...

Does Sweet Taste Potentiate Nicotine Cue Reactivity?

The investigators' aim is to test the prediction that sweet taste perception enhances the ability of nicotine to induce neural plastic changes in brain reward circuits to increase the saliency, liking and brain reactivity to the sight and vaporized flavor of electronic cigarettes (e-cigarettes).

DPP4 Activity, Microvascular Reactivity and Inflammation

Dipeptidyl peptidase 4 (DPP4) is a serine exopeptidase able to inactivate various oligopeptides involved in inflammation, immunity and vascular function. Our aim was to investigate the associations between constitutive levels of DPP4 activity and inflammatory biomarkers, skin microvascular reactivity, gut peptides, insulin resistance indexes, heart rate and blood pressure variability, and measures of adiposity in subjects with different grades of glucose tolerance.

Predictive Factors of Unpredicted Movement in Motor Evoked Potential

The purpose of this study was to identify the predictive factors of unpredicted movement in motor evoked potential (MEP) during intraoperative neurophysiologic monitoring in adult patients undergoing brain surgery.

SEP Changes During Deep Anesthesia

The relation between burst and suppression periods in transcranial and direct cortical recorded EEG with cortical amplitudes median nerve somatosensory evoked potentials is studied. 60 patients are included in this study: 15 patients undergoing brain tumor surgery, 15 spine surgery (University Hospital Düsseldorf) and 30 patients during general surgical procedures (Helios Klinikum Wuppertal).

Prediction by Ultrasound of the Risk of Hepatic Cirrhosis in Cystic Fibrosis

The specific aims for this study are: 1. To determine if sonographic findings predict the risk of progression of liver disease to cirrhosis by comparing cystic fibrosis subjects with heterogeneous echogenicity pattern on ultrasound to those with normal echogenicity pattern on ultrasound 2. To develop a database and biorepository of serum, plasma, urine and DNA to aid the investigations in ascertaining the mechanisms, consequences, genetic risk factors and ...

Effects of Smoking Environments on Brain Reactivity

The goal of this study is to evaluate correlations between brain reactivity (as assessed via functional magnetic resonance imaging (fMRI) following 24-h abstinence) and the amount of smoking in a specific location. The investigators will use ecological momentary assessment (EMA) to ask smokers to rate their exposure to, and smoking in, specific personal smoking environment cues (PSEs) over the course of 2 weeks before quitting smoking and 2 weeks after quitting smoking. The inv...

Evaluating a Novel Method of EEG Evoked Response Potential Analysis in Concussion Assessment, Young Adults and Adults

Concussion is widely recognized as a major public health concern in the United States and worldwide. Although many concussions resolve completely and spontaneously, almost 1 in 4 patients will go on to experience post-concussion syndrome (PCS). In the United States, PCS diagnoses have increased 100% from 2010-2015. Concurrently, recent advances in EEG evoked response potential analysis have led to a novel technique for assessing brain network activation (BNA) patterns. The purp...

Functional MRI Before and After Treatment for Depression

The purpose of this study is to help us understand how depression changes brain activity and how this relates to mood, anxiety, and cognitive functions like memory. We also hope to develop a brain imaging test that will predict either before or within two weeks of starting a medicine whether the treatment will work.

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