scholarly journals Effects of induced motion on manual aiming movements a comparison between tennis players and novices

2017 ◽  
Vol 81 (0) ◽  
pp. 1D-047-1D-047
Author(s):  
Yasuhiro Seya ◽  
Hiroyuki Shinoda
Keyword(s):  
Manual Aiming ◽  
Tennis Players ◽  
Aiming Movements ◽  
Induced Motion

Crossmodal Inhibition of Return in Adults with and Without Down Syndrome

2005 ◽  
Vol 22 (3) ◽  
pp. 277-290 ◽  
Author(s):  
Cheryl Glazebrook ◽  
Digby Elliott ◽  
James Lyons ◽  
Luc Tremblay
Keyword(s):  
Down Syndrome ◽  
Similar Pattern ◽  
Inhibition Of Return ◽  
Verbal Stimulus ◽  
Previous Trial ◽  
Manual Aiming ◽  
Verbal Cues ◽  
Aiming Movements ◽  
Inhibitory Processes

This study investigated inhibition of return in persons with and without Down syndrome (DS) when visual or verbal cues were used to specify a target in a crossmodal paradigm. Individuals with DS and without DS performed manual aiming movements to a target located in right or left hemispace. The target was specified by an endogenous visual or verbal stimulus. Both groups were significantly slower when responding to the same target as the previous trial when the target was cued in a different modality. Although participants with DS initiated and executed their movements more slowly, they demonstrated a similar pattern of inhibition as people without DS, suggesting that inhibitory processes are functioning normally in persons with DS.

The Use of Vision in Manual Aiming by Young and Older Adults

1996 ◽  
Vol 4 (2) ◽  
pp. 165-178 ◽  
Author(s):  
James Lyons ◽  
Digby Elliott ◽  
Laurie R. Swanson ◽  
Romeo Chua
Keyword(s):  
Older Adults ◽  
Young Adults ◽  
Movement Trajectory ◽  
Manual Aiming ◽  
Movement Initiation ◽  
Directed Movement ◽  
Healthy Older Adults ◽  
Aiming Movements ◽  
Kinesthetic Feedback ◽  
Aiming Movement

This study was designed to examine the influence of age and the availability of vision on the performance and kinematic characteristics of discrete aiming movements. Twelve young adults (19–25 years old) and 12 healthy older adults (62–82 years old) performed 130-mm aiming movements to targets with diameters of 5, 10, and 20 mm. On half the trial blocks, visual feedback about the aiming movement was eliminated upon movement initiation. Surprisingly, older adults were both as fast and as accurate as young adults regardless of the vision or target condition. While the velocity profiles of young and older adults were also similar, older adults exhibited a greater number of deviations in acceleration in both the vision and no-vision situations. Since these deviations are thought to reflect adjustments to the movement trajectory, older adults may rely more on visual and kinesthetic feedback for the control of goal-directed movement.

Movement Preparation and the Costs and Benefits Associated with Advance Information for Adults with Down Syndrome

1995 ◽  
Vol 12 (3) ◽  
pp. 239-249 ◽  
Author(s):  
David A. Le Clair ◽  
Digby Elliott
Keyword(s):  
Down Syndrome ◽  
Hemispheric Lateralization ◽  
Manual Aiming ◽  
Aiming Movements ◽  
Verbal Language ◽  
Control Subjects ◽  
Mental Handicaps ◽  
Advance Information ◽  
Aiming Movement ◽  
Valid Information

This study examined the extent to which individuals with Down syndrome benefit from visual and verbal advance information about a manual aiming movement. Adults with Down syndrome as well as control subjects with and without mental handicaps performed 10.5-cm manual aiming movements with their preferred hand. On each trial subjects were cued about the specific movement either visually or verbally. On different trial blocks, the cue provided either 50% or 80% certainty. Nonhandicapped control subjects initiated and completed their manual aiming movements more quickly than subjects with mental handicaps. As well, individuals with Down syndrome were found to be slower and more variable in reaction time than participants in the other mentally handicapped group when valid information was provided verbally but not when the cue was provided visually. These results are consistent with the proposal that atypical hemispheric lateralization for speech perception associated with Down syndrome disrupts communication between functional systems responsible for processing of verbal language and organizing movement (Elliott & Weeks, 1993b).

The role of vision for online control of manual aiming movements in persons with autism spectrum disorders

Autism ◽  
2009 ◽  
Vol 13 (4) ◽  
pp. 411-433 ◽  
Author(s):  
Cherylm. Glazebrook ◽  
David Gonzalez ◽  
Steve Hansen ◽  
Digby Elliott
Keyword(s):  
Autism Spectrum Disorders ◽  
Online Control ◽  
Autism Spectrum ◽  
Manual Aiming ◽  
Aiming Movements ◽  
Spectrum Disorders

Movement planning of video and of manual aiming movements

2005 ◽  
Vol 18 (3) ◽  
pp. 275-296 ◽  
Author(s):  
Luc Proteau ◽  
Patrick Bédard
Keyword(s):  
Movement Planning ◽  
Manual Aiming ◽  
Aiming Movements

Intermittent Vision and Discrete Manual Aiming

1995 ◽  
Vol 80 (3_suppl) ◽  
pp. 1203-1213 ◽  
Author(s):  
Digby Elliott ◽  
Barbara J. Pollock ◽  
James Lyons ◽  
Romeo Chua
Keyword(s):  
Closed Loop ◽  
High Index ◽  
Closed Loop Control ◽  
Manual Aiming ◽  
Loop Control ◽  
Aiming Movements ◽  
Movement Trajectories ◽  
Index Of Difficulty

This study was designed to assess how the precision requirements of discrete aiming movements affect the utility of brief visual samples provided during execution of movement. Subjects pointed with a hand-held stylus to targets with indices of difficulty of 3, 4, 5, and 6 bits with full vision, no vision, and in conditions in which 20-msec. visual samples were provided every 80, 140, or 200 msec. While intermittent vision required slightly longer movement times for targets with a high index of difficulty, subjects' accuracy was similar to the full-vision situation. Moreover, with intermittent vision, the movement trajectories resembled the full-vision and not the no-vision situation. It would appear that brief visual samples of the movement environment are sufficient for reasonably precise closed-loop control.

A Visual Representation and the Control of Manual Aiming Movements

1990 ◽  
Vol 22 (3) ◽  
pp. 327-346 ◽  
Author(s):  
Digby Elliott ◽  
Randy Calvert ◽  
Melanie Jaeger ◽  
Ruth Jones
Keyword(s):  
Visual Representation ◽  
Manual Aiming ◽  
Aiming Movements
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