Coordination of digit force variability during dominant and non-dominant sustained precision pinch

Li, Ké; Wei, Na; Yue, Shouwei; Thewlis, Dominic; Fraysse, François; Immink, Maarten A.; Eston, Roger G.

doi:10.1007/s00221-015-4276-y

Cited by 27 publications

(17 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This finding was in line with the previous finding from the effects of visual feedback on digit force regulation during single-digit pressing [16, 17] and two-digit pinching [10, 11]. For example, absence of visuomotor correction can reduce the irregular patterns in digit force structures compared to the condition with visual feedback [10, 11, 16, 17]. The simplified time-dependent structure of the vertical shear forces at the digits with tactile deficits reflected a decreased motor control flexibility in response to external variables.…”

Section: Discussionsupporting

confidence: 93%

“…Results of DFA showed that with reduced tactile sensitivity the shear force components in the vertical direction of the thumb or index finger had lower structural variability (Figure 2(a)). This finding was in line with the previous finding from the effects of visual feedback on digit force regulation during single-digit pressing [16, 17] and two-digit pinching [10, 11]. For example, absence of visuomotor correction can reduce the irregular patterns in digit force structures compared to the condition with visual feedback [10, 11, 16, 17].…”

Section: Discussionsupporting

confidence: 91%

“…For the normal force, the index finger showed lower structural variability (higher α DFA ) than the thumb (Figure 2(c)), which was consistent with the notion that the index finger is less flexible in control of digit normal force than the thumb [11]. For Fx , the index finger showed higher structural variability than the thumb, revealing an interdigit difference in organizing force structures against the load during precision grip (Figures 2(a) and 2(b)).…”

Section: Discussionsupporting

confidence: 78%

“…Recently, more and more studies have suggested that the fluctuating digit force in the process of sustained isometric pinch or stable precision grip contains dynamic patterns that might be highly sensitive to sensory modalities. For example, under nonvision condition when only the tactile and proprioceptive information is available, there are lower variability in the time-dependent structure of individual digit force and stronger interdigit force correlation, compared to the condition with visual feedback [9–11]; following a transient median nerve block at the wrist, the impaired sensorimotor system can alter the dynamical force coordination of the thumb and index finger and the structural variability of digit forces [12]. These findings provide evidence that digit force fluctuation is subject to sensorimotor control, yet more studies are needed to examine the role of tactile perception in this process.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of Tactile Sensitivity on Structural Variability of Digit Forces during Stable Precision Grip

Wei

Yue

2016

BioMed Research International

Self Cite

View full text Add to dashboard Cite

This study investigated the effects of fingertip tactile sensitivity on the structural variability of thumb and index finger forces during stable precision grip. Thirty right-handed healthy subjects participated in the experiment. Transient perturbation of tactile afferents was achieved by wrapping up the distal pads of the thumb or index finger with transparent polyethylene films. The time-dependent structure of each digit force and the variability of interdigit force correlation were examined by detrended fluctuation analysis (DFA) and detrended cross-correlation analysis (DCCA), respectively. Results showed that the tactile sensitivity affected αDFA of the vertical shear force Fx (F 3,239 = 6.814, p < 0.001) and αDCCA of Fx (χ 2 = 16.440, p < 0.001). No significant difference was observed in αDFA or αDCCA of the normal forces produced by the thumb or index finger. These results suggested that with blurred tactile sensory inputs the central nervous system might decrease the vertical shear force flexibility and increase the interdigit shear force coupling in order to guarantee a stable grip control of an object against gravity. This study shed light on the feedback and feed-forward strategies involved in digit force control and the role of SA-II afferent fibers in regulation of vertical shear force variability for precision grip.

show abstract

Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of Tactile Sensitivity on Structural Variability of Digit Forces during Stable Precision Grip

Wei

Yue

2016

BioMed Research International

Self Cite

View full text Add to dashboard Cite

show abstract

“…Asterisks indicate p < 0.016 and n.s. indicates p > 0.1. agreement with previous reports (Li et al, 2013(Li et al, , 2015Nataraj et al, 2015).…”

Section: Mep Variability Above and Beyond Predicted CV Of Mep (Cv Diff )supporting

confidence: 94%

Fluctuations in Human Corticospinal Activity Prior to Grasp

Rao

Parikh

2019

Front. Syst. Neurosci.

View full text Add to dashboard Cite

Neuronal firing rate variability prior to movement onset contributes to trial-to-trial variability in primate behavior. However, in humans, whether similar mechanisms contribute to trial-to-trial behavioral variability remains unknown. We investigated the time-course of trial-to-trial variability in corticospinal excitability (CSE) using transcranial magnetic stimulation (TMS) during a self-paced reach-to-grasp task. We hypothesized that CSE variability will be modulated prior to the initiation of reach and that such a modulation would explain trial-to-trial behavioral variability. Able-bodied individuals were visually cued to plan their grip force before exertion of either 30% or 5% of their maximum pinch force capacity on an object. TMS was delivered at six time points (0.5, 0.75, 1, 1.1, 1.2, and 1.3 s) following a visual cue that instructed the force level. We first modeled the relation between CSE magnitude and its variability at rest (n = 12) to study the component of CSE variability pertaining to the task but not related to changes in CSE magnitude (n = 12). We found an increase in CSE variability from 1.2 to 1.3 s following the visual cue at 30% but not at 5% of force. This effect was temporally dissociated from the decrease in CSE magnitude that was observed from 0.5 to 0.75 s following the cue. Importantly, the increase in CSE variability explained at least ∼40% of inter-individual differences in trial-to-trial variability in time to peak force rate. These results were found to be repeatable across studies and robust to different analysis methods. Our findings suggest that the neural mechanisms underlying modulation in CSE variability and CSE magnitude are distinct. Notably, the extent of modulation in variability in corticospinal system prior to grasp within individuals may explain their trial-to-trial behavioral variability.

show abstract

Sensorimotor control for dexterous grasping – inspiration from human hand

2022

Tactile Sensing, Skill Learning, and Robotic Dexterous Manipulation

View full text Add to dashboard Cite

Coordination of digit force variability during dominant and non-dominant sustained precision pinch

Cited by 27 publications

References 38 publications

Effects of Tactile Sensitivity on Structural Variability of Digit Forces during Stable Precision Grip

Effects of Tactile Sensitivity on Structural Variability of Digit Forces during Stable Precision Grip

Fluctuations in Human Corticospinal Activity Prior to Grasp

Sensorimotor control for dexterous grasping – inspiration from human hand

Contact Info

Product

Resources

About