Influence of Task Constraints and Device Properties on Motor Patterns in a Realistic Control Situation

Fuente, Hugo Loeches de la; Fernandez, Laure; Sarrazin, Jean-Christophe; Berton, Éric; Rao, Guillaume

doi:10.1080/00222895.2013.837424

Cited by 3 publications

(2 citation statements)

References 33 publications

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“…Practice under specific conditions has also been reported to lead to the deployment of a larger range of solutions [18–21]. Particularly interesting for the present purposes was the finding that practicing a target-pointing task in the presence of an unfamiliar force-field resulted in more flexible target-pointing behavior in a test condition without such an additional force-field [22].…”

Section: Introductionmentioning

confidence: 98%

Does practicing a wide range of joint angle configurations lead to higher flexibility in a manual obstacle-avoidance target-pointing task?

et al. 2017

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Flexibility in motor actions can be defined as variability in the use of degrees of freedom (e.g., joint angles in the arm) over repetitions while keeping performance (e.g., fingertip position) stabilized. We examined whether flexibility can be increased through enlarging the joint angle range during practice in a manual obstacle-avoidance target-pointing task. To establish differences in flexibility we partitioned the variability in joint angles over repetitions in variability within (GEV) and variability outside the solution space (NGEV). More GEV than NGEV reflects flexibility; when the ratio of the GEV and NGEV is higher, flexibility is higher. The pretest and posttest consisted of 30 repetitions of manual pointing to a target while moving over a 10 cm high obstacle. To enlarge the joint angle range during practice participants performed 600 target-pointing movements while moving over obstacles of different heights (5–9 cm, 11–15 cm). The results indicated that practicing movements over obstacles of different heights led participants to use enlarged range of joint angles compared to the range of joint angles used in movements over the 10 cm obstacle in the pretest. However, for each individual obstacle neither joint angle variance nor flexibility were higher during practice. We also did not find more flexibility after practice. In the posttest, joint angle variance was in fact smaller than before practice, primarily in GEV. The potential influences of learning effects and the task used that could underlie the results obtained are discussed. We conclude that with this specific type of practice in this specific task, enlarging the range of joint angles does not lead to more flexibility.

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Section: Introductionmentioning

confidence: 98%

Does practicing a wide range of joint angle configurations lead to higher flexibility in a manual obstacle-avoidance target-pointing task?

et al. 2017

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“…for advancements in estimations), EMG recordings will be the sole candidate examined in the present study. To our knowledge, only two studies1718 have measured EMG in Fitts’ task. Whereas they mainly focussed on co-contraction, their results indicated a potential for reorganisation of muscular coordination with increasing accuracy constraints.…”

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confidence: 99%

Functional coordination of muscles underlying changes in behavioural dynamics

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Rao

Perdikis

et al. 2016

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The dynamical systems approach addresses Bernstein’s degrees of freedom problem by assuming that the neuro-musculo-skeletal system transiently assembles and dismantles its components into functional units (or synergies) to meet task demands. Strikingly, little is known from a dynamical point of view about the functioning of the muscular sub-system in this process. To investigate the interaction between the dynamical organisation at muscular and behavioural levels, we searched for specific signatures of a phase transition in muscular coordination when a transition is displayed at the behavioural level. Our results provide evidence that, during Fitts’ task when behaviour switches to a different dynamical regime, muscular activation displays typical signatures of a phase transition; a reorganisation in muscular coordination patterns accompanied by a peak in the variability of muscle activation. This suggests that consistent changes occur in coordination processes across the different levels of description (i.e., behaviour and muscles). Specifically, in Fitts’ task, target size acts as a control parameter that induces a destabilisation and a reorganisation of coordination patterns at different levels of the neuro-musculo-skeletal system.

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A multi-level approach to investigate the control of an input device: application to a realistic pointing task

et al. 2014

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Influence of Task Constraints and Device Properties on Motor Patterns in a Realistic Control Situation

Cited by 3 publications

References 33 publications

Does practicing a wide range of joint angle configurations lead to higher flexibility in a manual obstacle-avoidance target-pointing task?

Does practicing a wide range of joint angle configurations lead to higher flexibility in a manual obstacle-avoidance target-pointing task?

Functional coordination of muscles underlying changes in behavioural dynamics

A multi-level approach to investigate the control of an input device: application to a realistic pointing task

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