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Effect of remote sensory noise on hand function post stroke.

Na Jin Seo¹, Marcella Lyn Kosmopoulos², Leah R Enders³

¹Department of Industrial and Manufacturing Engineering, University of Wisconsin-Milwaukee , Milwaukee, WI , USA ; Department of Occupational Science and Technology, University of Wisconsin-Milwaukee , Milwaukee, WI , USA ; Department of Electrical Engineering and Computer Science, University of Wisconsin-Milwaukee , Milwaukee, WI , USA ; Clinical & Translational Science Institute, Medical College of Wisconsin , Milwaukee, WI , USA.

Frontiers in Human Neuroscience

|December 6, 2014

Summary

Tactile sensory noise applied to the wrist improved hand motor function in chronic stroke survivors. This non-invasive method shows promise for enhancing hand rehabilitation and recovery after stroke.

Keywords:

hand function sensory noise sensory stimulation stochastic resonance stroke hand rehabilitation tactile sensation

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Area of Science:

Neuroscience
Rehabilitation Medicine
Biomedical Engineering

Background:

Hand motor impairment is a common and persistent challenge following stroke.
Sensory input plays a crucial role in facilitating motor function recovery.
Individuals with chronic stroke often exhibit tactile sensory deficits impacting hand function.

Purpose of the Study:

To investigate the efficacy of tactile sensory noise in improving hand motor function in chronic stroke survivors with sensory deficits.
To explore the potential of non-perceptible mechanical vibration applied to the wrist for enhancing hand dexterity and strength.

Main Methods:

A repeated measures pilot study design was employed.
Subthreshold white noise mechanical vibration was applied to the wrist during motor tasks.
Hand dexterity was assessed using the Nine Hole Peg Test and the Box and Block Test; pinch strength was also measured.

Main Results:

Significant improvements in hand dexterity (Nine Hole Peg Test, Box and Block Test) and pinch strength were observed when tactile sensory noise was applied compared to when it was off.
These improvements suggest a positive effect of subthreshold sensory stimulation on motor performance.

Conclusions:

Subthreshold tactile sensory noise applied to the wrist can enhance hand motor function in chronic stroke survivors.
The findings suggest a potential mechanism involving sensoriomotor cortex neuronal connections.
This easily adoptable approach, potentially via a wristband device, could complement existing hand rehabilitation strategies for stroke survivors with sensorimotor deficits.