A Computational Internal Model to Quantify the Effect of Sensorimotor Augmentation on Motor Output

Dollahon, Devon; Ryu, Seok Chang; Park, Hangue

doi:10.1109/embc44109.2020.9176109

Cited by 3 publications

(4 citation statements)

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“…To address the sensory loss and the ensuing balance problem, multiple motor augmentation approaches have been actively investigated, including exoskeletal assistance or functional electrical stimulation (FES) ( Kim et al, 2012 ; Chen et al, 2013 ). However, both exoskeleton and FES approaches apply corrective efforts directly to the motor output and bypass the central nervous system (CNS) ( Dollahon et al, 2020 ). The minimal involvement of the CNS may critically limit the neural reorganization necessary for balance enhancement.…”

Section: Introductionmentioning

confidence: 99%

Proportional sway-based electrotactile feedback improves lateral standing balance

Raghav Hari Krishna,

Kim,

Chang

et al. 2024

Front. Neurosci.

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IntroductionPlantar cutaneous augmentation is a promising approach in balance rehabilitation by enhancing motion-dependent sensory feedback. The effect of plantar cutaneous augmentation on balance has been mainly investigated in its passive form (e.g., textured insole) or on lower-limb amputees. In this study, we tested the effect of plantar cutaneous augmentation on balance in its active form (i.e., electrical stimulation) for individuals with intact limbs.MethodsTen healthy subjects participated in the study and were instructed to maintain their balance as long as possible on the balance board, with or without electrotactile feedback evoked on the medial side of the heel, synched with the lateral board sway. Electrotactile feedback was given in two different modes: 1) Discrete-mode E-stim as the stimulation on/off by a predefined threshold of lateral board sway and 2) Proportional-mode E-stim as the stimulation frequency proportional to the amount of lateral board sway. All subjects were distracted from the balancing task by the n-back counting task, to test subjects’ balancing capability with minimal cognitive involvement.ResultsProportional-mode E-stim, along with the n-back counting task, increased the balance time from 1.86 ± 0.03 s to 1.98 ± 0.04 s (p = 0.010). However, discrete-mode E-stim did not change the balance time (p = 0.669). Proportional-mode E-stim also increased the time duration per each swayed state (p = 0.035) while discrete-mode E-stim did not (p = 0.053).DiscussionThese results suggest that proportional-mode E-stim is more effective than discrete-mode E-stim on improving standing balance. It is perhaps because the proportional electrotactile feedback better mimics the natural tactile sensation of foot pressure than its discrete counterpart.

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Section: Introductionmentioning

confidence: 99%

Proportional sway-based electrotactile feedback improves lateral standing balance

Raghav Hari Krishna,

Kim,

Chang

et al. 2024

Front. Neurosci.

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“…As described in the internal model (Fig. 2) presented in our prior work [29], which was developed based on previous internal models [30], [31], both interaction gain (k) and sensory gain (β) can increase sensory feedback on the fingertip corresponding to the pinch. Therefore, the interaction gain (k) is likely to affect the closed-loop motor control performance as well as sensory feedback.…”

Section: Introductionmentioning

confidence: 99%

“…Note that the gain (k) can be adjusted simply by modulating the surface profile or parameters below the fingertips during a pinch, whose effect on the finger control is investigated and compared with the model-based understanding. [30], [31], with a new component called interaction gain (yellow highlighted) to consider the environmental interaction [29].…”

Section: Introductionmentioning

confidence: 99%

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Pinching Force Changes by Modulating the Interaction Gain Over the Fingertip

2022

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Motor control between the thumb and index finger is critical for holding and interacting precisely with an object. In case of an improper pinching force, especially when it stems from sensory problems, modulating the interaction gain by changing the contact surface properties is a promising solution because of its simplicity and minimal risk. In this pilot study, three healthy human subjects participated in the pinching experiment with two different surface areas to test the effect of interaction gain on motor control (88 mm 2 and 176 mm 2 as 1× and 2× surface areas). Subjects were asked to match their pinching force to the reference fingertip pressure applied to the other hand. The results demonstrated that subjects applied less force to the thumb when the contact surface area was smaller, perhaps to compensate for the increase in pressure, while the contact surface area did not change the force applied to the index finger. The ratio of the force applied to the 2× surface area to the force applied to the 1× surface area was 1.19±0.02 (Mean±STE) and 1.00±0.02 for the thumb and index finger, respectively. The pinching force was also affected by the tactile memory. When subjects pinched the 2× surface area after pinching the 1× surface area, the pinching force was higher than the one at pinching the 2× surface area from the beginning. These results suggest that environmental intervention is strong enough to bias the motor output of the sensorimotor system.

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Internal Model With Interaction Gain Explains Plantar Ground Reaction Force Changes According to the Plantar Surface Area

Dollahon,

Park

2024

IEEE Sensors J.

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A Computational Internal Model to Quantify the Effect of Sensorimotor Augmentation on Motor Output

Cited by 3 publications

References 37 publications

Proportional sway-based electrotactile feedback improves lateral standing balance

Proportional sway-based electrotactile feedback improves lateral standing balance

Pinching Force Changes by Modulating the Interaction Gain Over the Fingertip

Internal Model With Interaction Gain Explains Plantar Ground Reaction Force Changes According to the Plantar Surface Area

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