Somatosensation is divided into multiple discrete modalities that we think of separably: e.g., tactile, proprioceptive, and temperature sensation. However, in processes such as haptics, those all interact. If one intended to artificially generate a sensation could be used for stereognosis, example, it would crucial understand these interactions. We are presently examining the relationship between tactile proprioceptive this context. In overview some our recent work, show signals normally...

Agency is action aimed at goals selected by an agent. A deterministic world view leaves scant room for agency. To reconcile the arguments, we represent as nested control systems, ranging from clearly to volitional. Negative feedback minimizes deviations setpoints (goals). Goals are determined higher modules in a hierarchy of gamma-efferent spindles through reflexes operant responses; these last, and larger system that contains them, called Self, comprise volitional agents. When operants...

ABSTRACT Neuroprosthetic limbs, regardless of their sophisticated motor control, require sensory feedback to viably interact with the environment. Toward that aim, authors examined interrelationships between tactile and proprioceptive sensations. Through human psychophysics experiments, they evaluated error patterns subjects estimating hand location in a horizontal 2-dimensional workspace under 3 conditions. While cues did not significantly affect structure pattern errors, touching reduced...

During contact, phasic and tonic responses provide feedback that is used for task performance perceptual processes. These disparate temporal dynamics are carried in peripheral nerves, produce overlapping signals cortex. Using longitudinal intrafascicular electrodes inserted into the median nerve of a nonhuman primate, we delivered composite stimulation consisting onset release bursts to capture rapidly adapting sustained stochastic ongoing response slowly receptors. To measure stimulation’s...

Because of the flexibility and redundancy neuromuscular skeletal systems, human arm can reach to same target in space with various configurations. However, posture during such movement is generally very consistent little variation across subjects. To investigate fundamental mechanism for this observation a model developed. This paper presents method determine 4 degree-of-freedom (DOF) at each via-point along trajectory reaching movement. The predicted data matched experimental three joint...

Introduction Proprioceptive error of estimated fingertip position in two-dimensional space is reduced with the addition tactile stimulation applied at fingertip. Tactile input does not disrupt participants’ estimation strategy, as individual vector maps maintain their overall structure. This relationship suggests integration proprioception and information improves proprioceptive estimation, which can also be improved trained mental focus attention. Task attention arousal are physiologically...

Chronic multi-channel neural recording recently has been applied to study dynamic brain function. Often these studies rely upon chronically implanted multi-electrode arrays, raising questions about the stability of long-term neuronal recording. The objective this paper is investigate and track recorded signal activity for over 3 years in awake, behaving primate through analysis unit waveforms principle component (PCA) multi-units. For time span from beginning end session, monkey was trained...

Hand and arm coordination orientation during reach to grasp tasks were studied. Subjects instructed perform reaching making a grip-type on targets with various angles locations. We tested three conditions: movements of fixed location orientation, predictably perturbed randomly orientation. For target orientations the hand rotated quickly together initiation movement. The amount rotation was proportional final required for grip. In predictable task, would first make original then correct Such...

Tactile cues arising from interactions with objects have a sense of directionality which affects grasp. Low latency responses to varied grip perturbations indicate that grasp safety margins are exaggerated in certain directions and conditions. In the ulnar-radial axis vertical, evidence suggests distal downward more sensitive task parameters larger margins. This that, for purpose applying forces fingers, reference frames respect hand gravity both operation. this experiment, we examined human...

Proprioceptive error of estimated fingertip position in two-dimensional space is reduced with the addition tactile stimulation to fingertip. This input does not disrupt subjects’ estimation strategy, as individual vector maps maintain their overall geometric structure. relationship suggests an integration proprioception and sensory information enhance proprioceptive estimation. To better understand this multisensory integration, we explored effect electrotactile vibrotactile fingertips place...

This special issue was inspired by the 2011 meeting of Society for Neural Control Movement (NCM) in San Juan, Puerto Rico. NCM is an international community scientists, clinician-investigators, educators, and students whose common goal to understand how brain controls movement. The society’s mission provide a forum advancing knowledge on structure function neural systems underlying control movement their associated disorders (http://ncm-society.org/). April Rico exemplified these goals. In...