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Aman Sharma, MHSc; Ricardo Torres-Moreno, PhD; Karl Zabjek, PhD; Jan Andrysek, PhD

Toward an artificial sensory feedback system for prosthetic mobility rehabilitation: Examination of sensorimotor responses. Aman Sharma, MHSc; Ricardo Torres-Moreno, PhD; Karl Zabjek, PhD; Jan Andrysek, PhD. Aim Examine sensorimotor responses to mobility-relevant stimuli. Relevance

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Aman Sharma, MHSc; Ricardo Torres-Moreno, PhD; Karl Zabjek, PhD; Jan Andrysek, PhD

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  1. Toward an artificial sensory feedback system for prosthetic mobility rehabilitation: Examination of sensorimotor responses Aman Sharma, MHSc; Ricardo Torres-Moreno, PhD; Karl Zabjek, PhD; Jan Andrysek, PhD

  2. Aim • Examine sensorimotor responses to mobility-relevant stimuli. • Relevance • People with lower-limb amputation have reduced mobility due to loss of sensory information, which may be restored by artificial sensory feedback systems built into prostheses. • For an effective system, it is important to understand how humans sense, interpret, and respond to the feedback that would be provided.

  3. Method • Applied stimuli (vibrations) to thigh region. • Responses involved leg movements. • Performed 3 experiments to examine effects of: • Location of stimuli. • Frequency of stimuli. • Means for providing response. • Measured: • Reaction time (RT): duration between application of stimulus and initiation of response. • Response accuracy.

  4. Results • Overall average RTs for 1 response option: • 0.808 s. • Response accuracies: • >90%. • Higher vibration frequencies in anterior regions of thigh produced fastest RTs. • RTs increased when participants were given >1 stimulus and response option.

  5. Conclusion • Long sensorimotor responses may be limiting factor in development of artificial feedback system for mobility rehabilitation applications. • However, feed-forward techniques could potentially address these limitations.

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