Role of Tactile Noise in the Control of Digit Normal Force

@article{Naceri2021RoleOT,
  title={Role of Tactile Noise in the Control of Digit Normal Force},
  author={Abdeldjallil Naceri and Yasemin B Gultekin and Alessandro Moscatelli and Marc O. Ernst},
  journal={Frontiers in Psychology},
  year={2021},
  volume={12}
}
Whenever we grasp and lift an object, our tactile system provides important information on the contact location and the force exerted on our skin. The human brain integrates signals from multiple sites for a coherent representation of object shape, inertia, weight, and other material properties. It is still an open question whether the control of grasp force occurs at the level of individual fingers or whether it is also influenced by the control and the signals from the other fingers of the… 
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References

SHOWING 1-10 OF 38 REFERENCES
Signals in tactile afferents from the fingers eliciting adaptive motor responses during precision grip
TLDR
Evidence is provided that signals in tactile afferent units are utilized in the adaptation of the force coordination to the frictional condition while human subjects lift small objects using the precision grip between the tips of the fingers.
Control of grasp stability in humans under different frictional conditions during multidigit manipulation.
TLDR
The results extend previous findings based on two-digit tasks to multidigit tasks by showing that subjects adjust fingertip forces at each digit to the local friction and suggest that subjects adapted the load distribution to the current frictional condition by regulating the normal forces to allow slips to occur early in the lift task, prior to object lift-off.
Coordination of multi-digit positions and forces during unconstrained grasping in response to object perturbations
TLDR
It is proposed that digit forces were modulated online based on self-chosen digit locations during the holding phase in order to successfully compensate sudden external torques.
Roles of glabrous skin receptors and sensorimotor memory in automatic control of precision grip when lifting rougher or more slippery objects
TLDR
The present paper deals quantitatively with the regulation of the coordination between the grip force and the vertical lifting force, denoted as the load force, while small objects were lifted, positioned in space and replaced by human subjects using the pinch grip.
Independent control of human finger‐tip forces at individual digits during precision lifting.
TLDR
The findings suggest that the force distribution among the digits represents a digit‐specific lower‐level neural control establishing a stable grasp that is related to the total vertical lifting and normal forces required by the lifting task and the relevant physical properties of the manipulated object.
Importance of cutaneous feedback in maintaining a secure grip during manipulation of hand-held objects.
TLDR
The data from the present study suggest that cutaneous afferents are required for setting and maintaining the background level of the grip force in addition to their phasic slip-detection function and their role in adapting the gripforce/load force ratio to the friction on initial contact with an object.
Factors influencing the force control during precision grip
TLDR
It was found that the applied grip force was critically balanced to optimize the motor behaviour so that slipping between the skin and the gripped object did not occur and the grip force did not reach exeedingly high values.
Multidigit force control during unconstrained grasping in response to object perturbations.
TLDR
The results suggest that the nervous system uses a default whole hand synergistic control to maintain a stable grasp regardless of the number of digits involved in the task, their position on the objects, and the type and frequency of external perturbations.
Hierarchical control of static prehension: I. Biomechanics
TLDR
The results suggest that the neural controller uses a different strategy in the one-hand task as compared to other tasks, while bimanual prehension involving two persons differs from one-person two-hand tasks.
Task-specific modulation of multi-digit forces to object texture
TLDR
The present study examined whether grasp force sharing patterns are invariant when the constraint of maintaining the object orientation vertical against gravity is removed and found that in both tasks texture changes at individual digits elicited force changes at that digit as well as other digits.
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