Somatosensory Processing in Focal Hand Dystonia

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00579033
Recruitment Status : Unknown
Verified March 2007 by University Health Network, Toronto.
Recruitment status was:  Recruiting
First Posted : December 21, 2007
Last Update Posted : December 21, 2007
Dystonia Medical Research Foundation
Information provided by:
University Health Network, Toronto

December 17, 2007
December 21, 2007
December 21, 2007
May 2007
Not Provided
Dystonia Rating Scale [ Time Frame: 4 weeks ]
Same as current
No Changes Posted
Neuroimaging maps of digit representation [ Time Frame: 4 weeks ]
Same as current
Not Provided
Not Provided
Somatosensory Processing in Focal Hand Dystonia
Tactile Operant Conditioning To Alleviate Focal Hand Dystonia Symptoms

Patients with focal dystonia experience uncontrollable movements of the hand during certain types of skilled movements. Though the origin of the disorder is not fully understood, it is thought that brain areas involved in moving the hands and receiving touch information from the hands, are involved. For example, patients with dystonia affecting the hand show changes in their ability to perceive touch - this is something that typically escapes the patients own awareness. Further, the area of the brain receiving touch information has a disrupted representation of the finger skin surfaces.

The goal of our research is to improve dystonia symptoms in patients with hand dystonia. We will attempt to achieve this goal by implementing an intensive training treatment that requires patients to attend to, and use touch information applied to specific fingertips. Previous work has attempted to alter touch perception using sensory training and improvements in motor control (hand writing) of dystonia patients were observed. For example, learning to read Braille improves tactile perception and handwriting in focal hand dystonia. A different approach to treat focal hand dystonia involves a technique called repetitive transcranial magnetic stimulation (rTMS), and this can also temporarily improve hand writing in dystonia patients. The proposed research will attempt to alter touch processing using touch training alone, or in combination with rTMS. Rather than train using Braille reading, the sensory training will be applied using a systematic, experimenter controlled stimulus set that focuses on touch stimuli applied to individual digits. Importantly patients will have to associate certain types of touch information with rewards and other touch input with the lack of a reward.

The study will first involve measuring the location and representation of the touch in the brain using multiple brain mapping tools. These tools include functional magnetic resonance imaging and magnetoencephalography; when both tools are used a very accurate picture of finger representation can be obtained, and we also know what brain areas respond to touch stimuli. Dystonia symptoms and touch perception will also be assessed. Next, patients will participate in a training intervention that involves 15 days(2.5 hr/day) of touch training applied to the fingertips of the dystonia affected hand. Patients will identify the touch targets amongst distractors and receive on-line performance feedback. The goal of the training is to provide the cortex with regular boundaries of fingers and in this way, attempt to re-shape the sensory cortex to accept these boundaries. Another group of patients will receive rTMS. The goal of the rTMS is to create an environment in sensory cortex that is open or 'ready' to accept changes induced by tactile stimulation. The rTMS will be immediately followed by the tactile training. A third group of patients will receive a placebo version of rTMS followed by tactile training. The latter group will allow us to understand if rTMS has a definite effect on the physiology of the patient. Following the 15-day training, we will assess the brains representation of fingertips, changes in dystonia symptoms and changes in the perception of touch stimuli.

This research will advance the treatment of focal hand dystonia and assist the design of precise remediation training tailored to the dystonia patient.

Not Provided
Not Applicable
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single (Outcomes Assessor)
Primary Purpose: Treatment
  • Focal Hand Dystonia
  • Musician's Dystonia
  • Writer's Cramp
  • Dystonic Cramp
  • Other: Tactile training + sham rTMS
    tactile training for 2.5/hr/day for 15 days - this plus the sham rTMS
  • Other: Tactile training + rTMS
    tactile training 2.5/hr/day for 15 days plus daily 5Hz rTMS
  • Sham Comparator: 1
    Intervention: Other: Tactile training + sham rTMS
  • Active Comparator: 2
    Intervention: Other: Tactile training + rTMS
Not Provided

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
Unknown status
Same as current
July 2008
Not Provided

Inclusion Criteria:

  • Diagnosis of focal hand dystonia including any but not limited to the following:

    • Writer's cramp,
    • Musician's cramp,
    • Dystonic cramp.

Exclusion Criteria:

  • Other neurological conditions
  • Epilepsy
  • Carpal tunnel or disorders of peripheral nerves
  • Psychiatric illness
Sexes Eligible for Study: All
18 Years and older   (Adult, Older Adult)
Contact information is only displayed when the study is recruiting subjects
Not Provided
Not Provided
Aimee Nelson, Assistant Professor, Toronto Western Research Institute, University of Waterloo
University Health Network, Toronto
Dystonia Medical Research Foundation
Principal Investigator: Aimee J Nelson, PhD Toronto Western Research Institute, University of Waterloo
University Health Network, Toronto
March 2007

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP