Characterization of 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.

NCT Number	NCT05473429
Lead Sponsor	National Institutes of Health Clinical Center (CC)
Conditions	Intellectual Disability
Enrollment	215 participants
Start Date	2026-03-27
Primary Completion	2026-10-06 (estimated)
Study Completion	2026-10-06 (estimated)
Updated on ClinicalTrials.gov	2026-07-30