Directional control of rapid arm movements: The role of the kinetic visual feedback system.

1993 ◽  
Vol 47 (4) ◽  
pp. 678-696 ◽  
Author(s):  
Jean Blouin ◽  
Normand Teasdale ◽  
Chantal Bard ◽  
Michelle Fleury
Keyword(s):  
Visual Feedback ◽  
Arm Movements ◽  
Feedback System ◽  
Directional Control ◽  
Rapid Arm Movements

scholarly journals Influencing and Interpreting Visual Input: The Role of a Visual Feedback System

2006 ◽  
Vol 26 (41) ◽  
pp. 10368-10371 ◽  
Author(s):  
E. Gruberg ◽  
E. Dudkin ◽  
Y. Wang ◽  
G. Marin ◽  
C. Salas ◽  
...  
Keyword(s):  
Visual Feedback ◽  
Feedback System ◽  
Visual Input

Repetitive Goal-Directed Arm Movements in Children with Developmental Coordination Disorders: Role of Visual Information

1994 ◽  
Vol 11 (2) ◽  
pp. 190-202 ◽  
Author(s):  
Birgit Rösblad ◽  
Claes von Hofsten
Keyword(s):  
Visual Feedback ◽  
Visual Information ◽  
Developmental Disorders ◽  
Arm Movements ◽  
Optoelectronic Device ◽  
Same Sex ◽  
Coordination Disorders ◽  
Visual Specification ◽  
Developmental Coordination Disorders

Are children with developmental coordination disorders (DCD) more dependent on vision for constructing movements than children without DCD? How important is visual feedback of the hand and how important is visual specification of the goal in this respect? These questions were studied in 10 children with DCD, 3 girls and 7 boys, ranging in age between 7 and 16 years. Each child was matched against a child of the same sex and age without DCD. The task was to pick beads, one at a time, from one cup and carry them to another cup. With the aid of a mirror arrangement and a curtain, visual information about the performing hand and the cups and beads was manipulated. The movements were monitored with an optoelectronic device (SELSPOT II). The results showed that the children with DCD made movements that were both slower and much more variable than those of their age-matched peers, The withdrawal of visual information affected both groups of children in similar ways. However, one boy with developmental disorders revealed a remarkable decrease in performance when the task was carried out without visual information of either the hand or the cups and beads.

scholarly journals The Role of Visual Feedback and Creative Exploration for the Improvement of Timing Accuracy in Performing Musical Ornaments

2012 ◽  
Vol 30 (2) ◽  
pp. 187-204 ◽  
Author(s):  
Renee Timmers ◽  
Makiko Sadakata ◽  
Peter Desain
Keyword(s):  
Visual Feedback ◽  
Music Performance ◽  
Feedback System ◽  
Creative Activity ◽  
Timing Accuracy ◽  
Creative Processes ◽  
Performance Skills ◽  
Temporal Precision ◽  
Exploration Behavior

in developing a visual feedback system for a creative activity such as music performance, the objective is not just to reinforce one particular manner of performing. Instead, a desirable characteristic might be that the visual feedback enhances flexibility and originality, in addition to contributing to performance precision. In an experimental study focused on the timing of a musical ornament, we examined whether the instruction to explore ornament timing in training trials with or without visual feedback leads to improved temporal precision in imitating target performances of the ornament, and whether visual feedback enhances the performance diversity during training. The study uncovered distinct strategies of exploration of the performance of the musical ornament and highlighted the dynamics of exploration behavior during training. Visual feedback enhanced exploration of temporal characteristics and influenced imitation accuracy. This study opens up educational possibilities for the training of performance skills and provides direction for further investigation of creative processes in performance.

scholarly journals Investigating the feasibility and acceptability of real-time visual feedback in reducing compensatory motions during self-administered stroke rehabilitation exercises: A pilot study with chronic stroke survivors

2019 ◽  
Vol 6 ◽  
pp. 205566831983163 ◽  
Author(s):  
Shayne Lin ◽  
Jotvarinder Mann ◽  
Avril Mansfield ◽  
Rosalie H Wang ◽  
Jocelyn E Harris ◽  
...  
Keyword(s):  
Pilot Study ◽  
Upper Extremity ◽  
Visual Feedback ◽  
Feedback System ◽  
Optimal Recovery ◽  
Chronic Stroke ◽  
Stroke Survivors ◽  
Perfect Agreement ◽  
Rehabilitation Programs ◽  
Shoulder Elevation

Introduction Homework-based rehabilitation programs can help stroke survivors restore upper extremity function. However, compensatory motions can develop without therapist supervision, leading to sub-optimal recovery. We developed a visual feedback system using a live video feed or an avatar reflecting users' movements so users are aware of compensations. This pilot study aimed to evaluate validity (how well the avatar characterizes different types of compensations) and acceptability of the system. Methods Ten participants with chronic stroke performed upper-extremity exercises under three feedback conditions: none, video, and avatar. Validity was evaluated by comparing agreement on compensations annotated using video and avatar images. A usability survey was administered to participants after the experiment to obtain information on acceptability. Results There was substantial agreement between video and avatar images for shoulder elevation and hip extension (Cohen's κ: 0.6–0.8) and almost perfect agreement for trunk rotation and flexion (κ: 0.80–1). Acceptability was low due to lack of corrective prompts and occasional noise with the avatar display. Most participants suggested that an automatic compensation detection feature with visual and auditory cuing would improve the system. Conclusion The avatar characterized four types of compensations well. Future work will involve increasing sensitivity for shoulder elevation and implementing a method to detect compensations.

Unusual aspects of the polyamine transport system affect the design of strategies for use of polyamine analogues in chemotherapy

2007 ◽  
Vol 35 (2) ◽  
pp. 318-321 ◽  
Author(s):  
J.L.A. Mitchell ◽  
T.K. Thane ◽  
J.M. Sequeira ◽  
R. Thokala
Keyword(s):  
Regulatory Protein ◽  
Feedback System ◽  
Uptake System ◽  
Polyamine Synthesis ◽  
Polyamine Analogues ◽  
Binding Partners ◽  
Polyamine Transport ◽  
Polyamine Uptake ◽  
Tumour Cell Growth

One strategy for inhibiting tumour cell growth is the use of polyamine mimetics to depress endogenous polyamine levels and, ideally, obstruct critical polyamine-requiring reactions. Such polyamine analogues make very unusual drugs, in that extremely high intracellular concentrations are required for growth inhibition or cytotoxicity. Cells exposed to even sub-micromolar concentrations of such analogues can achieve effective intracellular levels because these compounds are incorporated by the very aggressive polyamine uptake system. Once incorporated to these levels, many of these analogues induce the synthesis of a regulatory protein, antizyme, which inhibits both polyamine synthesis and the transporter they used to enter the cell. Thus this feedback system allows steady-state maintenance of effective cellular doses of such analogues. Accordingly, effective cellular levels of polyamine analogues are generally inversely related to their capacity to induce antizyme. Antizyme activity is down-regulated by interaction with several binding partners, most notably antizyme inhibitor, and at least a few tumour tissues exhibit deficiencies in antizyme expression. Our studies explore the role of antizyme induction by several polyamine analogues in their physiological response and the possibility that cell-to-cell differences in antizyme expression may contribute to variable sensitivities to these agents.

Role of the Visual Feedback for Stabilization of Vertical Human Posture during Induced Body Oscillations

Motor Control ◽  
1987 ◽  
pp. 129-134
Author(s):  
G. N. Gantchev ◽  
P. Gatev ◽  
N. Tankov ◽  
N. Draganova ◽  
S. Dunev ◽  
...  
Keyword(s):  
Visual Feedback ◽  
Human Posture
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