Many measures have been employed to quantify an aspect of healthy, skilled movement, which has been termed “movement smoothness” of which jerk is the most common. We propose a new, biologicallymotivated quantification of “movement smoothness”: submovement overlap. In previous work, changes in submovements have been linked to changes in movement smoothness. Further investigation revealed that in...

The method proposed here produces trajectories of articulatory movements based on a kinematic triphone model and the mimimum-jerk model. The kinematic triphone model, which is constructed from articulatory data obtained in the experiments through the use of a magnetic sensor system, is characterized by three kinematic features for a triphone and intervals between two successive phonemes in the ...

A single-shock stimulus to the skin of widespread and distant parts of the body such as the face, sites in the upper limb, trunk, buttock, and feet produced changes in amplitude of the ankle jerk. A regulated and stabilized system was used for eliciting the ankle jerk and for delivering an unvarying single-shock conditioning stimulus; 35 normal subjects were studied. The characteristics of the ...

The effortless speech production in humans requires coordinated movements of the articulators such as lips, tongue, jaw, velum, etc. Therefore, measured trajectories obtained are smooth and slowly-varying. However, the trajectories estimated from acoustic-to-articulatory inversion (AAI) are found to be jagged. Thus, energy minimization is used as smoothness constraint for improving performance ...

One of the most remarkable recent developments in classical physics has been the realization that simple nonlinear deterministic equations can have unpredictable ~chaotic! long-term solutions. Chaos is now thought to be rather common in nature, and the study of nonlinear dynamics has brought new excitement to one of the oldest fields of science. The widespread availability of inexpensive person...

This study was designed to detect the sensitivity of different methods of eliciting knee jerks and to compare the conventional methods with the newly purposed maneuver. Knee jerk (a deep tendon reflex) was elicited in 123 apparently normal population (77 males and 46 females) with three different methods (1) without applying reinforcement, (2) applying Jendrassik maneuver (strong voluntary cont...

Abstract. In this paper, the time-optimal velocity planning problem for five axis CNC machining along a given parametric tool path under chord error, acceleration, and jerk constraints is studied. The velocity planning problem under confined chord error and acceleration is reduced to an equivalent linear programming problem by discretizing the tool path and other quantities. As a consequence, a...

A data-driven approach for analyzing faults in wind turbine gearbox is developed and tested. More specifically, faults in a ring gear are predicted in advance. Time-domain statistical metrics, such as jerk, root mean square (RMS), crest factor (CF), and kurtosis, are investigated to identify faulty components of a wind turbine. The components identified are validated with the fast Fourier trans...

Studies of sensory-motor performance, including those concerned with changes because of age, disease, or therapeutic intervention, often use measures based on jerk, the time derivative of acceleration, to quantify smoothness and coordination. However, results have been mixed: some researchers report sensitive discrimination of subtle differences, whereas others fail to find significant differen...

The present contribution is motivated by recent studies on the assessment of the fluency of body movements during complex motor tasks. In particular, we focus on the estimation of the Cartesian kinematic jerk (namely, the derivative of the acceleration) of the hips’ orientation during a full threedimensional movement. The kinematic jerk index is estimated on the basis of gyroscopic signals acqu...