Finger joint coordination during tapping

Kuo, P. C.; Lee, David L.; Jindrich, Devin L.; Dennerlein, Jack T.

doi:10.1016/j.jbiomech.2005.10.028

Cited by 45 publications

(58 citation statements)

References 18 publications

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“…Specifically, we analyzed how movement speed and kinetic energy are correlated with the model parameters. The kinetic energy profiles were found to be indicative to changes in finger inter-segment or -joint coordination and dynamics (Kuo et al, 2006).…”

Section: Analysis Of Correlation Between Model Parameters and Movemenmentioning

confidence: 98%

Biodynamic modeling, system identification, and variability of multi-finger movements

Lee

Zhang

2007

Journal of Biomechanics

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Section: Analysis Of Correlation Between Model Parameters and Movemenmentioning

confidence: 98%

Biodynamic modeling, system identification, and variability of multi-finger movements

Lee

Zhang

2007

Journal of Biomechanics

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“…Studies of typing (Kuo et al, 2006) involve tasks where the contact surface is not rigid and the goal is not to produce a well directed sustained static force against it. In contrast, the acquisition of precision pinch for manipulation of rigid objects requires abruptly making contact with the object to immediately generate well directed static fingertip forces.…”

Section: Introductionmentioning

confidence: 99%

Neural Control of Motion-to-Force Transitions with the Fingertip

Venkadesan¹,

Valero-Cuevas²

2008

J. Neurosci.

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The neural control of tasks such as rapid acquisition of precision pinch remains unknown. Therefore, we investigated the neural control of finger musculature when the index fingertip abruptly transitions from motion to static force production. Nine subjects produced a downward tapping motion followed by vertical fingertip force against a rigid surface. We simultaneously recorded three-dimensional fingertip force, plus the complete muscle coordination pattern using intramuscular electromyograms from all seven index finger muscles. We found that the muscle coordination pattern clearly switched from that for motion to that for isometric force ϳ65 ms before contact ( p ϭ 0.0004). Mathematical modeling and analysis revealed that the underlying neural control also switched between mutually incompatible strategies in a time-critical manner. Importantly, this abrupt switch in underlying neural control polluted fingertip force vector direction beyond what is explained by muscle activation-contraction dynamics and neuromuscular noise ( p Յ 0.003). We further ruled out an impedance control strategy in a separate test showing no systematic change in initial force magnitude for catch trials where the tapping surface was surreptitiously lowered and raised ( p ϭ 0.93). We conclude that the nervous system predictively switches between mutually incompatible neural control strategies to bridge the abrupt transition in mechanical constraints between motion and static force. Moreover because the nervous system cannot switch between control strategies instantaneously or exactly, there arise physical limits to the accuracy of force production on contact. The need for such a neurally demanding and time-critical strategy for routine motion-to-force transitions with the fingertip may explain the existence of specialized neural circuits for the human hand.

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“…5(a-g)) and compared qualitatively with the EMG data measured by Kuo et al (2006) (Fig. 5(h)), which are related to the muscle activation timing.…”

Section: Resultsmentioning

confidence: 94%

“…Dennerlein et al (1998) assessed muscle activities during the keystroke task; their results suggested that the role of the extrinsic finger flexors during a keystroke is to overcome the activation force of the keyswitch, while the extrinsic extensors are to perform the upswing rather than stop the downswing. Kuo et al (2006) analyzed the relationship among joint coordination, kinematics, muscle activation patterns, and energy profiles during the tapping task and found that the activation of the intrinsic muscles began slightly before the initiation of the downswing motion, while the activation of the extrinsic flexors started after the initiation of the downward finger motion. However, a quantitative analysis of the dynamic loading in each individual muscle and tendon in a finger has not been performed during the tapping test.…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, we are going to theoretically analyze the joint torques and muscle forces and their relationships to the impact force at the fingertip and the mass moment of inertia of the finger sections. Furthermore, the theoretically predicted muscle force variations in the finger will be compared with the EMG signals of the previous study (Kuo et al, 2006). The proposed model will be applicable for realistic problems and it will include realistic bony shapes, nonlinear mechanical properties of the ligaments and tendons and physiological muscle models.…”

Section: Introductionmentioning

confidence: 99%

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