Hypersensitivity in Tourette Syndrome

This study has been completed.
Information provided by:
National Institutes of Health Clinical Center (CC)
ClinicalTrials.gov Identifier:
First received: August 23, 2006
Last updated: May 25, 2011
Last verified: May 2011

This study will investigate how the sensitivity to touch and smell in patients with Tourette syndrome (TS) may differ from that of people without TS. TS is a neurological disorder that causes people to have uncontrolled movements called "tics." A tic can also be vocal, like a cough or bark or string of bad words. The tic is preceded by a "premonitory urge" that may feel like an itch or pressure that builds until the tic occurs. To some patients, the tic feels like a response to an involuntary sensation. In patients with TS, sensory information may be processed differently than it is in people without TS. This study will compare how strong a sensation feels in TS patients and healthy volunteers. It will also look for muscle activity that may be responsible for the feelings in the area of the tic.

Healthy normal volunteers and people with Tourette syndrome, 18 to 65 years of age, may be eligible for this study. Candidates are screened with a medical history and brief physical and neurological examinations. TS patients complete a questionnaire about their tics and are interviewed by a psychiatrist. Women who can become pregnant will have a urine pregnancy test prior to any other procedures. Pregnant women cannot participate.

All participants undergo sensory testing for touch and smell. They are asked to distinguish between a scented and scentless object and rate how strongly they feel the scent. Later, with their eyes closed, they are asked to tell whether or not they are being touched, and to rate how intensely they felt the touch.

In addition to the sensory testing, TS patients, but not normal volunteers, undergo electromyography (EMG), a test that measures the electrical activity of muscles. For surface EMG, small metal disks called electrodes are filled with a conductive gel and taped to the skin. Wire EMG involves inserting a wire into a muscle using a needle. All patients have surface EMG and those who consent to it will also have wire EMG.

Tourette's Syndrome

Study Type: Observational
Official Title: Hypersensitivity in Tourette Syndrome: An Evaluation of Perceived Intensity Versus Threshold

Resource links provided by NLM:

Further study details as provided by National Institutes of Health Clinical Center (CC):

Enrollment: 46
Study Start Date: August 2006
Estimated Study Completion Date: May 2011
Detailed Description:


This study will explore sensory phenomena associated with Tourette syndrome (TS). The first part will evaluate threshold levels versus perceived intensity of tactile and olfactory stimuli in areas reported to be hypersensitive in TS patients. The second part will use electromyography (EMG) to seek correlation between muscle activity and the perceived intensity of "urge" in focal areas of premonitory sensations.


Twenty-six patients and 22 control subjects will be studied. Subjects can be of any race, gender, handedness, or age from 18 to 65 years.


To determine olfactory and tactile threshold, n-butanol and Von Frey hairs will be presented in forced-choice modified method of limits paradigms. Perceived intensity will be examined using a generalized labeled magnitude scale (gLMS), whose word values are placed on a ruler for numerical reporting. Randomly arranged series of 7 stimuli for olfaction and touch will be presented in 4 sets, and subjects will report a number on the gLMS that corresponds to the intensity of each sensation. Both threshold and intensity will be measured in the peroneal nerve territory in all subjects, and at one other variable place, which will be matched 1:1 between patients and controls. The variable spot will consist of a patient's sensory tic site. Next, EMG activity will be measured from up to 8 muscles in the area of a sensory tic. Patients will report when a sensory tic is occurring, and will be asked to resist the motor tic for at least 12 seconds from that point. Total EMG activity will be measured in muscles surrounding the sensation at 1, 4, and 7 seconds before and after the tic.


Outcome measures include the sensory threshold values for olfaction and touch and the reported intensity values. The outcome measures of the EMG study include the power of total EMG activity at time points before and after a tic.


Ages Eligible for Study:   18 Years to 65 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Healthy Volunteers ages 18 to 65 who have who have given their consent.

Patients will be ages 18 to 65 and have clinically documented Tourette's syndrome or chronic motor tic disorder as defined by DSM-IV-TR (American Psychiatric Association, 2000) and evaluation of tic severity using the Yale Tic Scale (YGTS). This criterion will be established by preliminary screening in the NINDS Movement Disorders Outpatient Clinic. Structure Clinical Interview for (DSMIV SCID) will be administered to all patients to ensure that strict DSM-IV criteria for Tourette Syndrome have been met and to assess for possible comorbid psychiatric disorders.

Patients with at least moderate premonitory urge, as evaluated with the PUTS.


Subjects younger than 18 or older than 65 years.

Subjects with 1) major depression, 2) bipolar disorder, or 3) psychotic disorder.

Subjects who are unable to abstain from alcohol or any psychiatric medications 24 hours prior to the study.

Subjects with acute or chronic upper respiratory illness, nasal allergies, or subjects using medications to treat these conditions, including antihistamines, nasal topical steroids, vasoconstrictor nasal sprays, or normal saline sprays.

Women who are pregnant.

Individuals with Restless Legs syndrome.

Individuals with a diagnosis of peripheral neuropathy.

  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00368433

United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Institute of Neurological Disorders and Stroke (NINDS)
  More Information

ClinicalTrials.gov Identifier: NCT00368433     History of Changes
Other Study ID Numbers: 060232  06-N-0232 
Study First Received: August 23, 2006
Last Updated: May 25, 2011
Health Authority: United States: Federal Government

Keywords provided by National Institutes of Health Clinical Center (CC):
Sensory Processing
Tic Disorder
Tourette Syndrome
Tourette's Syndrome
Healthy Volunteer

Additional relevant MeSH terms:
Tourette Syndrome
Basal Ganglia Diseases
Brain Diseases
Central Nervous System Diseases
Genetic Diseases, Inborn
Heredodegenerative Disorders, Nervous System
Immune System Diseases
Mental Disorders
Movement Disorders
Nervous System Diseases
Neurodegenerative Diseases
Neurodevelopmental Disorders
Pathologic Processes
Tic Disorders

ClinicalTrials.gov processed this record on May 30, 2016