Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"Reaching movements"”.
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The control of reaching movements by young infants
Infant reaching movements have tortuous handpaths and multipeaked speed curves. It has been hypothesised that these movements comprise sequences of ballistic motor units whose boundaries are marked by troughs in the speed-time curve. Error correction, if any, is assumed to take place between and …
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The control of reaching movements by young infants
Infant reaching movements have tortuous handpaths and multipeaked speed curves. It has been hypothesised that these movements comprise sequences of ballistic motor units whose boundaries are marked by troughs in the speed-time curve. Error correction, if any, is assumed to take place between and …
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Contribution of Vision and Proprioception to the Precision of Reaching Movements
… kinematic experiments to examine whether or not reaching movements would also show such strong reliance on vision. In Experiment 1, subjects used their dominant right hand to perform reaches, with or without a delay, to an external visual target or to their own left fingertip positioned either by …
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It's all in the wrist : a quantitative characterization of human wrist control
… on understanding how humans make coordinated reaching movements, yielding valuable insight into the planning and control of reaching movements, and establishing a foundation for robot-assisted rehabilitation. The goal of this doctoral research was to provide a quantitative characterization of …
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Role of the precentral cortex in adapting behavior to different mechanical environments
We routinely produce movements under different mechanical contexts. All interactions with the physical environment, such as swinging a hammer or lifting a carton of milk, alter the forces experienced during movement. With repeated experience, sensorimotor maps are adapted to maintain a high level …
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From thought to action
… the neural representation of targets before reaching movements and the generation of prosthetic control signals through stochastic modeling and estimation. In the first part, I show that temporal and history dependence contributes to the representation of targets in the ensemble spiking …
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Selectivity for Movement Direction in the Human Brain
In daily life, we frequently execute reaching movements, for example to be able to grasp our mobile phone. The processing of movement direction is fundamental to efficiently reach the target object. Many neurophysiological studies reported neuronal populations selective for movement direction in …
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Time domain characteristics of human force control in rejection of transient disturbances during movement
… disturbance forces perpendicular to concurrent reaching movements. The data was analyzed with the goals of both verifying the feasibility of a proposed control model, and then clarifying the capabilities, limitations and properties of such a controller.
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Neural Correlates of Reach Planning and Execution
… other primates often interact with the world by reaching and grabbing objects with their hands. This seemingly simple activity is a challenging computational problem that requires the nervous system to transform sensory input into muscle activations that move the hand appropriately through space. …
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The Role of the Dorsal Premotor and Superior Parietal Cortices in Decoupled Visuomotor Transformations
… transformations required during visually-guided reaching movements. Our brains are primed to reach directly towards a viewed object, a situation that has been termed a “standard” or coupled reach. Such direct eye-hand coordination is common across species and is crucial for basic survival. …
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Movement Function Follows Spatial Form: Coordinate System Implications for Online Visual Feedback Control of the Hand
… control of the hand is essential for accurate reaching movements. Without visual signals of either the hand or target position, reaches are inaccurate and imprecise; therefore the brain uses a relative positional signal to control movements online. Previous studies suggest that movements are …
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The development of spatially-accurate reaching behaviour in early infancy
… spatial characteristics of objects with their reaching and prehensile behaviours. The reaching behaviour of infants ranging in age from two to seven months was videotaped to determine whether they tended to adjust their reaching appropriately to variations in the physical distance, solidity and …
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The development of spatially-accurate reaching behaviour in early infancy
… spatial characteristics of objects with their reaching and prehensile behaviours. The reaching behaviour of infants ranging in age from two to seven months was videotaped to determine whether they tended to adjust their reaching appropriately to variations in the physical distance, solidity and …
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Brain-Machine Interface for Reaching: Accounting for Target Size, Multiple Motor Plans, and Bimanual Coordination
… sensory (S1) and motor (M1) cortex during reaching movements. By varying target size during reaching movements, I discovered the cortical correlates of the speed-accuracy tradeoff known as Fitts' law. Similarly, I analyzed cortical motor processing during tasks where the motor plan is …
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Exploring a behavioral role for presynaptic inhibition at spinal sensory-motor synapses
… in the adult severely perturbs goal-directed reaching movements, and uncovers a pronounced forelimb motor oscillation that appears to have its basis in an enhancement in the gain of sensory feedback. Together, our findings uncover an essential motor behavioral role for this specialized set of …
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Unsupervised learning of vocal tract sensory-motor synergies
… but it has not drawn the research attention that reaching movements or walking gaits have. Motivated by the use of dimensionality reduction algorithms in learning muscle synergies and perceptual primitives that reflect the structure in biological systems, an approach to learning sensory-motor …
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Bilateral arm training with rhythmic auditory cueing : rehabilitation metts music therapy
… home training of drum playing in repetitive reaching movements, practicing for three hours a week. They were randomly assigned to the treatment group (Bilateral Arm Training with Rhythmic Auditory Cueing; <em>n</em> = 2) and control group (Bilateral Arm Training only;<em> n</em>= 1). …
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Neuromuscular modularity and behavioral correlates of motor control
… subserve the control and learning of forelimb movements. Among these principles, I focused on muscular coordination patterns, motor cortical excitability, and sensorimotor interactions. I found that muscle activity in grasping and reaching behaviors could be reconstructed by linear combinations …
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Mirror Neurons are Modulated by Reward Expectation and Grip Force in the Sensorimotor Cortices (S1, M1, PMd, PMv)
… when primates make, or observe, grasping movements. Recent work indicates that reward expectation influences M1 during manual, observational, and Brain Machine Interface (BMI) reaching movements. Previous work showed MN are modulated by subjective value. Here we expand on the above work …
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On the neuronal processing of movement dynamics
… described, monkeys executed visually instructed reaching movements while holding the handle of a robotic arm. Motors attached to the robot allowed turning on and off perturbing forces that deviated the hand of the monkeys. After some exposure, the monkeys adapted to the perturbation. The …
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