Intellectual Disability Clinical Trial
Official title:
Characterization of the Nociception Phenotype in Individuals With Intellectual Disability
Background: People with intellectual disability (ID) often have physical disabilities as well. These physical problems can affect their bones, muscles, nerves, and gastrointestinal tracts. All of these issues can also cause pain. Yet little research has been done on pain in people with ID. Objective: To compare brain responses to unpleasant stimuli in people with and without ID. Eligibility: People aged 8 to 30 years diagnosed with an ID. Healthy volunteers without an ID are also needed. Design: The study requires only 1 visit of up to 4 hours. Participants with ID may come for up to 5 shorter visits instead. Participants will take a test to measure their level of ID. They will have a physical exam. Both groups will answer questions about pain and how their bodies react to it. They will answer questions about how they respond to things they see, feel, hear, smell, and taste. They will answer questions about their social behaviors. Caregivers may answer questions if the participant cannot. Both groups will have a test to measure their brain activity. Participants will wear a special cap, like a swim cap, with sensors and wires. Sensors to examine the heart will be placed on the skin of their chest with stickers. An elastic band will be placed around the middle of their body to measure how fast they are breathing. Sensors to measure sweat will be placed on two fingers. Participants will have heat, cold, brushing, and mild electrical stimuli to different parts of their body. Participants will rank how each stimulus feels using a scale with numbers or a scale with faces.
STUDY DESCRIPTION: The study aims to evaluate the somatosensory response to innocuous and noxious stimuli in individuals with Intellectual Disability (ID) compared to healthy controls. OBJECTIVES: Primary Objective: To characterize brain activation patterns using electroencephalography (EEG) and cerebral functional-near-infrared spectroscopy (fNIRS) in response to innocuous and noxious stimulation in individuals with ID (ages, 8-30 years), compared with the brain activation pattern observed in healthy controls. We hypothesize that compared to healthy controls, individuals with ID will present decreases in oxygenated hemoglobin (measured by fNIRS) in pain responsive regions (e.g., secondary somatosensory cortex), in response to standardized noxious stimuli (heat, cold, and electrical). In addition, individuals with ID will also present smaller suppression of oscillation in alpha and beta frequencies (measured by EEG at central sites) in response to these stimuli. Exploratory Objective: To determine the relationship between brain activation patterns to innocuous and noxious stimuli with physiological and behavioral responses to the same stimuli, in individuals with ID. We hypothesize that decreased oxygenated hemoglobin in response to noxious stimuli in the secondary somatosensory cortex, as well as smaller suppression of oscillations in alpha and beta frequencies at central sites in individuals with ID will correlate with changes in heart rate, galvanic skin response and pupil dilation. In addition, we hypothesize that decreased oxygenated hemoglobin to noxious thermal and electrical stimuli in the secondary somatosensory cortex, as well as smaller suppression of oscillations in alpha and beta frequencies will also be associated with behavioral observations (e.g. vocal, social and changes in facial, body and extremities activity). ENDPOINTS: Primary Endpoints: 1. fNIRS response to innocuous and noxious stimuli: oxygenated and deoxygenated hemoglobin concentration measured in the secondary somatosensory cortex. 2. EEG response to innocuous and noxious stimuli: Alpha and beta oscillations measured at central sites (C3 and C4). 3. Physiological responses to innocuous and noxious stimulation (heart rate, respiratory rate, galvanic skin response, and pupillary changes). 4. Behavioral responses to noxious stimulation (e.g. vocal, social and changes in facial, body and extremities activity). ;
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