Tactile Sensory Control of Dexterous Manipulation in Humans

During dexterous manipulation with the fingertips, forces are applied to objects’ surfaces. To achieve grasp stability, these forces must be appropriate given the properties of the objects and the skin of the fingertips, and the nature of the task. It has been demonstrated that tactile sensors in the fingertips provide crucial information about both object properties and mechanical events critical for the control of fingertip forces, while in certain tasks vision may also contribute to predictions of required fingertip actions. This thesis focuses on two specific aspects of the sensory control of manipulation…


Grasp stability in manipulation
Sensorimotor control during manipulations with ‘passive’
predictable object
Sensorimotor control during restraint of ‘active’ objects
Adaptation of fingertip forces to object’s physical properties and the role of tactile signals from the digits
Types of tactile sensors
Adjustment to friction and independent control of fingertip forces
Adjustments to objects’ surface curvatures
Tactile afferent control of fingertip forces in restraint of’active objects’
Significance of tactile information about direction of fingertip
force in sensorimotor control
Tactile afferent responses to mechanical transients
Objectives of the present study
Specific aims
Control of fingertip forces at individual digits in reactive restraint tasks (Paper I-II)
Encoding of parameters of fingertip stimuli by tactile afferents
(Paper III-V)
Comments on data collection and analysis
Control of fingertip forces at individual digits in restraint tasks
(Paper I andII)
Adaptation of fingertip forces to local friction…

Author: Birznieks, Ingvars

Source: Umea University

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