Clinical trial NCT01177462: Transformation of Somatosensory and Visual Coordinate Systems
Official title: The Transformation of Coordinates Between Somatosensory and Visual Systems: a Neurophysiological Study
Study type: OBSERVATIONAL
Overall status: UNKNOWN
Conditions: Stroke
Keywords: coordinate system
normal
Lead sponsor: Chang Gung Memorial Hospital
Sponsor class: OTHER
First posted: 2010-08-09
Enrollment: 90
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Observational model: CASE_CONTROL
Time perspective: CROSS_SECTIONAL
Sampling method: NON_PROBABILITY_SAMPLE
Study population: We will recruit 40 normal healthy adult subjects (equal to and more than 18 years old); the exclusion criteria are subjects with brain pathology, peripheral neuropathy and limb amputation. We will also recruit 50 stroke patients, the including criteria are stroke patients with stable medical condition and being capable of receiving the evaluations. In this group, stroke patients with peripheral neuropathy, and unstable medical condition.

Brief summary: Manipulation of object is a multisensory experience that includes tactile motion between the object and the fingerpad, visual motion elicited by the motion the object and the movement of the hand, and the active motor commend to control upper limb and hand conformation. It remains to be determined how such a complex interaction between touch and vision could be achieved effortlessly. In the present study, we will investigate how the motion information is transformed between touch and vision using the most novel approaches in human psychophysics, neuropsychology and monkey neurophysiology. Specifically, we will present tactile motion on primate fingerpads using a recently developed ball stimulator with a design in which we vary the direction of motion with respect to the skin surface and also vary the hand conformation and position. This setup allows us to systematically sample the possible scenarios involving coordinate transformation between the somatosensory and visual systems in conditions that could occur in hand exploration and object manipulation in daily life. We will present these tactile stimuli on normal human subject as well as stroke patients such as patients with spatial hemineglect. Finally, we will record from macaque monkeys in cortical areas that are thought to underlie the transformation of coordinates, such as the primary somatosensory cortex and posterior parietal cortex. The results of the present study will contribute to the understanding of multisensory integration and the rehabilitation for patients with impaired use of spatial information.


Eligibility criteria: For stoke patients

Inclusion Criteria:

* stroke patients
* stable medical condition
* can cooperate in evaluation

Exclusion Criteria:

* peripheral neuropathy
* limb ambulation

Primary outcomes:
measure: Perceived direction of tactile motion
timeFrame: Once; specifically for stroke patients, 6 months after the onset of stroke
Secondary outcomes:
Other outcomes:
Locations:
city: Taoyuan County
country: Taiwan
facility: Chang Gung Memorial Hospital
Study officials:
affiliation: Chang Gung Memorial Hospital
name: Yu-Cheng Pei, MD PhD
role: PRINCIPAL_INVESTIGATOR
References: