Vibration Perception Thresholds of Skin Mechanoreceptors Are Influenced by Different Contact Forces

Zippenfennig, Claudio; Wynands, Bert; Milani, Thomas L.

doi:10.3390/jcm10143083

Cited by 15 publications

(13 citation statements)

References 35 publications

(75 reference statements)

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“…The skin on the human hand can perceive stimuli, transform them into physiological responses, and subsequently transfer them to the brain via the nervous system. − The decisions from the brain make the hand finish complex and dexterous works. , The sensing of environmental information is accomplished by the numerous mechanoreceptors on the skin. − Unfortunately, this road is partially blocked for amputees. Currently, a prosthetic hand is one among a handful of choices that are left for amputees. − Although intelligent and complex artificial hands, , including an anthropomorphic hand, − have been developed in the past four decades, the manipulation is still very far from human manipulation skills, not only due to the limitations of both basic parts and the actuation system integrated into such a complex and small space, but also due to a lack of efficient sensors and control algorithms.…”

Section: Introductionmentioning

confidence: 99%

Capacitive Sensor Combining Proximity and Pressure Sensing for Accurate Grasping of a Prosthetic Hand

Yang

et al. 2022

ACS Appl. Electron. Mater.

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Intelligent control of a prosthetic hand is the core to realize accurate grasping. The traditional sensors inside the hand or finger can only give indirect information regarding the events occurring at the interface of the finger tip and objects, which may cause misjudgment in grasping. Herein, we design a capacitive sensor with the capability of both proximity and force detection for the prosthetic hand (HIT-V). The sensor is composed of a pair of ring-circle copper foils as electrodes, in which is the dielectric layer with a pyramid microstructure. As a result, the sensor can detect an object approaching from as far as 100 mm and contact forces up to 12 N, which, respectively, denote the finger operation space and maximum force load of the prosthetic hand. Furthermore, the proposed sensor exhibited excellent stability, mechanical flexibility, and deformability. Finally, capacitive sensors are used for grasping control on the prosthetic hand, which exhibit the abilities of stopping an approaching process and tracking a step force. The abovementioned performance shows the sensor’s potential ability to achieve complex control on prosthetic hands.

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Section: Introductionmentioning

confidence: 99%

Capacitive Sensor Combining Proximity and Pressure Sensing for Accurate Grasping of a Prosthetic Hand

Yang

et al. 2022

ACS Appl. Electron. Mater.

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“…Applied force has the potential to change VPT [27]. Therefore, we also examine a force-sensitive SE-VPT (SE-VPT-F T ).…”

Section: B Haptic Smartphone Assessment Resultsmentioning

confidence: 99%

“…Since contact force influences VPT [27], we tested the implication of force on CHASI using the alternative SVMbased SE-VPT-F T . We find little change in the correlation's practical significance, indicating that force may not be an explicit requirement when using the proposed SE-VPT.…”

Section: Discussionmentioning

confidence: 99%

Cutaneous perception identification using smartphone haptic feedback

Torres¹,

Abbott²,

Wang³

et al. 2022

Preprint

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<p>The skin’s ability to sense its environment is vital to activities of daily living. Cutaneous sensory perception diagnostics allow for the early detection and symptom tracking of tactile dysfunction. However, lack of access to healthcare and the limited frequency of current screening tools can leave skin sensation impairments undiscovered or unmonitored. This work presents a smartphone application for Cutaneous Hand Assessment with a Smartphone Interface (CHASI) to establish Vibrational Perception Thresholds (VPT). CHASI’s vibrational output and force measurement abilities are also characterized. An 18-participant cross-sectional study, with both normative subjects and subjects with sensation impairment, compares the monofilament test with smartphone established VPT (SE- VPT). We find a high positive correlation between SE-VPT and monofilament scores (rs=0.83, p = 0.00014). We also investigate the sensitivity of our proposed SE-VPT method to the motions and forces applied to the touchscreen. We find that variations in force do not alter the practical significance of the monofilament correlation. These results further the smartphone as a potential diagnostic and monitoring tool for hand health.</p>

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“…During testing, the output amplitude of a probe with a rounded tip (7.8 mm diameter) was documented using an acceleration sensor (MMA2240KEG, Freescale Semiconductor). An integrated force sensor (DS050A9, Disynet GmbH) monitored the force between probe and skin, which was maintained between 0.7–1.2 N (Holowka et al, 2019 ; Zippenfennig, Wynands, et al, 2021 ). Participants wore headphones (QuietComfort 25, Bose) to eliminate environmental noise.…”

Section: Methodsmentioning

confidence: 99%

“…However, all stimuli must travel through the intermediate skin before reaching the receptor. Therefore, mechanical characteristics of the skin inevitably play a role in stimulus transmission—a topic that is discussed in recent research (Holowka et al, 2019 ; Strzalkowski, Triano, et al, 2015 ; Zippenfennig, Wynands, et al 2021 ). Interestingly, these skin properties are not static but can adapt when confronted with mechanical stress (Sanders et al, 1995 ).…”

Section: Introductionmentioning

confidence: 99%

Does plantar skin abrasion affect cutaneous mechanosensation?

Wynands

Zippenfennig

Holowka

et al. 2022

Physiological Reports

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In humans, plantar cutaneous mechanoreceptors provide critical input signals for postural control during walking and running. Because these receptors are located within the dermis, the mechanical properties of the overlying epidermis likely affect the transmission of external stimuli. Epidermal layers are highly adaptable and can form hard and thick protective calluses, but their effects on plantar sensitivity are currently disputed. Some research has shown no effect of epidermal properties on sensitivity to vibrations, whereas other research suggests that vibration and touch sensitivity diminishes with a thicker and harder epidermis. To address this conflict, we conducted an intervention study where 26 participants underwent a callus abrasion while an age‐matched control group ( n = 16) received no treatment. Skin hardness and thickness as well as vibration perception thresholds and touch sensitivity thresholds were collected before and after the intervention. The Callus abrasion significantly decreased skin properties. The intervention group exhibited no change in vibration sensitivity but had significantly better touch sensitivity. We argue that touch sensitivity was impeded by calluses because hard skin disperses the monofilament's standardized pressure used to stimulate the mechanoreceptors over a larger area, decreasing indentation depth and therefore stimulus intensity. However, vibration sensitivity was unaffected because the vibrating probe was adjusted to reach specific indentation depths, and thus stimulus intensity was not affected by skin properties. Since objects underfoot necessarily indent plantar skin during weight‐bearing, calluses should not affect mechanosensation during standing, walking, or running.

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Vibration Perception Thresholds of Skin Mechanoreceptors Are Influenced by Different Contact Forces

Cited by 15 publications

References 35 publications

Capacitive Sensor Combining Proximity and Pressure Sensing for Accurate Grasping of a Prosthetic Hand

Capacitive Sensor Combining Proximity and Pressure Sensing for Accurate Grasping of a Prosthetic Hand

Cutaneous perception identification using smartphone haptic feedback

Does plantar skin abrasion affect cutaneous mechanosensation?

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