The dynamics of goal-directed rhythmical aiming

Mottet, Denis; Bootsma, Reinoud J.

doi:10.1007/s004220050521

Cited by 137 publications

(184 citation statements)

References 29 publications

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“…Second, the trajectory choice may differ between precision conditions. Mottet and Bootsma (1999) showed that, with increased precision demands, systematic changes in kinematics occur; most notably movement speed increases in the middle part of the movement and decreases near the target. In other words, higher precision demands lead to higher accelerations in the first part of the movement and higher decelerations in the second part, where the actual precision is required.…”

Section: Discussionmentioning

confidence: 99%

Effects of precision demands and mental pressure on muscle activation and hand forces in computer mouse tasks

Visser

Looze

Graaff³

et al. 2004

Ergonomics

116

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The objective of the present study was to gain insight into the effects of precision demands and mental pressure on the load of the upper extremity. Two computer mouse tasks were used: an aiming and a tracking task. Upper extremity loading was operationalized as the myo-electric activity of the wrist flexor and extensor and of the trapezius descendens muscles and the applied grip-and click-forces on the computer mouse. Performance measures, reflecting the accuracy in both tasks and the clicking rate in the aiming task, indicated that the levels of the independent variables resulted in distinguishable levels of accuracy and work pace. Precision demands had a small effect on upper extremity loading with a significant increase in the EMG-amplitudes (21%) of the wrist flexors during the aiming tasks. Precision had large effects on performance. Mental pressure had substantial effects on EMG-amplitudes with an increase of 22% in the trapezius when tracking and increases of 41% in the trapezius and 45% and 140% in the wrist extensors and flexors, respectively, when aiming. During aiming, grip-and click-forces increased by 51% and 40% respectively. Mental pressure had small effects on accuracy but large effects on tempo during aiming. Precision demands and mental pressure in aiming and tracking tasks with a computer mouse were found to coincide with increased muscle activity in some upper extremity muscles and increased force exertion on the computer mouse. Mental pressure caused significant effects on these parameters more often than precision demands. Precision and mental pressure were found to have effects on performance, with precision effects being significant for all performance measures studied and mental pressure effects for some of them. The results of this study suggest that precision demands and mental pressure increase upper extremity load, with mental pressure effects being larger than precision effects. The possible role of precision demands as an indirect mental stressor in working conditions is discussed.

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Section: Discussionmentioning

confidence: 99%

Effects of precision demands and mental pressure on muscle activation and hand forces in computer mouse tasks

Visser

Looze

Graaff³

et al. 2004

Ergonomics

116

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show abstract

“…An advantage of this manipulation is that, by varying the stringency of the two required subtasks, graded variations in the degree of attentional asymmetry may be induced. However, a considerable disadvantage is that the associated spatial demands may alter the limb's component dynamics [e.g., influencing the (non-linear) stiffness of the component oscillator, see Mottet & Bootsma, 1999]. Theoretically, such differences in component dynamics may affect the relative phase dynamics as well (Daffertshofer, Van Den Berg, & Beek, 1999;Fuchs, Jirsa, Haken, & Kelso, 1996).…”

Section: Experimental Manipulations and Predictionsmentioning

confidence: 99%

Laterally focused attention modulates asymmetric coupling in rhythmic interlimb coordination

Poel

Peper

Beek

2006

Psychological Research

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Peters (J Motor Behav 21:151-155, 1989; Interlimb coordination: neural, dynamical and cognitive constraints, Academic, Orlando, pp 595-615, 1994) suggested that expressions of handedness in bimanual coordination may be reflections of an inherent attentional bias. Indeed, previous results indicated that focusing attention on one of the limbs affected the relative phasing between the limbs in a manner comparable to the effects of hand dominance. The present study extended the comparison between the effects of attentional focus and handedness by testing their impact on the interactions between the limbs. Both lefthanded and right-handed participants performed rhythmic bimanual coordination tasks (in-phase and antiphase coordination), while directing attention to either limb. Using brief mechanical perturbations, the degree to which the limbs were influenced by each other was determined. The results revealed that the non-dominant limb was more strongly affected by the dominant limb than vice versa and that, in line with Peters' proposition, this handedness-related asymmetry in coupling strength was reduced when attention was focused on the non-dominant limb, thereby highlighting the potential relation between inherent (handednessrelated) asymmetries and voluntary attentional asymmetries. In contrast to previous findings, the (commonly observed) phase lead of the dominant limb was attenuated (rather than accrued) when attention was focused on this limb. This unexpected result was explained in terms of the observed attention-related difference in amplitude between the limbs.

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“…The first hypothesis proposes that discrete movements are fundamental, whereas rhythmic movements are mere concatenations of discrete movements (Feldman, 1980;Shadmehr and Wise, 2005). In contrast, the second hypothesis states that rhythmic movements are fundamental, whereas discrete movements are truncated rhythmic movements (Schöner, 1990;Mottet and Bootsma, 1999). The third hypothesis assumes that rhythmic and discrete movements are two different (or partially different) classes of movements (Sternad et al, 2000;Buchanan et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Transfer of Visuomotor Learning between Discrete and Rhythmic Movements

Ikegami¹,

Hirashima²,

Taga³

et al. 2010

J. Neurosci.

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As long as we only focus on kinematics, rhythmic movement appears to be a concatenation of discrete movements or discrete movement appears to be a truncated rhythmic movement. However, whether or not the neural control processes of discrete and rhythmic movements are distinct has not yet been clearly understood. Here, we address this issue by examining the motor learning transfer between these two types of movements testing the hypothesis that distinct neural control processes should lead to distinct motor learning and transfer. First, we found that the adaptation to an altered visuomotor condition was almost fully transferred from the discrete out-andback movements to the rhythmic out-and-back movements; however, the transfer from the rhythmic to discrete movements was very small. Second, every time a new set of rhythmic movements was started, a considerable amount of movement error reappeared in the first and the following several cycles although the error converged to a small level by the end of each set. Last, we observed that when the discrete movement training was performed with intertrial intervals longer than 4 s, a significantly larger error appeared, specifically for the second and third cycles of the subsequent rhythmic movements, despite a seemingly full transfer to the first cycle. These results provide strong behavioral evidence that different neuronal control processes are involved in the two types of movements and that discrete control processes contribute to the generation of the first cycle of the rhythmic movement.

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The dynamics of goal-directed rhythmical aiming

Cited by 137 publications

References 29 publications

Effects of precision demands and mental pressure on muscle activation and hand forces in computer mouse tasks

Effects of precision demands and mental pressure on muscle activation and hand forces in computer mouse tasks

Laterally focused attention modulates asymmetric coupling in rhythmic interlimb coordination

Asymmetric Transfer of Visuomotor Learning between Discrete and Rhythmic Movements

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