This commentary raises some issues still unresolved in the study of the reach-to-grasp movement, namely the operational definition of the components of the reach-to-grasp movement, the independence of these components, and the equivocal interpretation of the existing literature. Lastly, this commentary addresses issues pertaining to object properties that require both visual and haptic determination.
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The Reach-to-Grasp Movement: A New Look at an Old Problem?
Patricia L. Weir
Assessment of Postural Response after a Self-initiated Perturbation
Nicolas Termoz, Luc Martin, and François Prince
The aim of this study was to assess postural response efficiency to a self-initiated perturbation using an original method based on the inverted pendulum model. Eight young subjects were asked to perform bilateral arm raising and lowering at 3 different speeds while standing on a force plate. The time necessary to recover a steady state following the movement was computed by analyzing the time evolution of the coefficient of determination between the center of pressure and center of mass difference variable (COP-COM) and the horizontal acceleration of the COM. Results show a spatial reorganization (hip strategy) of the segments following the perturbation and a strong influence of the linear relationship to the arm velocity. However, the conditions of arm velocity did not have any effect on the time response of the postural control, suggesting that this parameter would be an invariant characteristic of the movement. These results support the existence of an internal representation of the inertial constraints related to the movement execution.
The Evaluation of Changes of Angles in Selected Joints During Topspin Forehand in Table Tennis
Ziemowit Bańkosz and Sławomir Winiarski
, greater and lesser trochanters, and sacral point— Pietraszewski, Winiarski, & Jaroszczuk, 2012 ). This arrangement allowed for the assigning of a local reference system and a determination of the position of the center of gravity for each of the segments: head, trunk, and both lower and upper extremities
Inter- and Intrasubject Similarity of Muscle Synergies During Bench Press With Slow and Fast Velocity
Afshin Samani and Mathias Kristiansen
set was initiated with eight repetitions, and in the following set the number of repetitions was decreased to five. In the remaining sets, only three repetitions were performed. The load was increased until the 3RM was established. On average, four sets were required for the determination of the 3RM
Freezing Degrees of Freedom During Motor Learning: A Systematic Review
Anderson Nascimento Guimarães, Herbert Ugrinowitsch, Juliana Bayeux Dascal, Alessandra Beggiato Porto, and Victor Hugo Alves Okazaki
Newell ( 2006 ) Skiing on a simulator 5 men (16–24 years) 140 MRCM and PC Greater range of motion after practice and evidence of different coordination pattern between the superior and inferior parts of the body, reinforce the influence of the task and the individual constraints on the determination of
Dual-Task Cost Effects on Static Posture Control Parameters and Choice Reaction Time in Individuals With and Without Intellectual Disabilities
Danica Janicijevic, Saray Muñoz-López, Andrés Román Espinaco, and Carmen Gutiérrez-Cruz
(lower right panel) during the single-task condition ( y -axis). ID = intellectual disability; R 2 = coefficient of determination. Figure 4 The association between participant age ( x -axis) and the total displacement magnitude (upper left panel), total sway area (upper right panel), mediolateral
Feasibility of Volitional Reaction Time Tests in Athletes: A Systematic Review
Danica Janicijevic and Amador Garcia-Ramos
, additional methodological considerations emerged as important for precise determination of RT duration. Recalling the RT definition, two crucial time points should be detected precisely in order to accurately determine RT, and they are (a) the instant of the stimulus presentation and (b) the initiation of
Reliability and Sensitivity of Reaction Time Measurements During Quasi-Realistic Soccer Situations
Lazar Tomic, Danica Janicijevic, Aleksandar Nedeljkovic, Bojan Leontijevic, and Amador García-Ramos
bilateral force platforms (AMTI BP600400; Advanced Mechanical Technology, Inc., Watertown, MA). The recordings of the camera and force platforms were initiated simultaneously using an external trigger, which allowed for a determination of the stimulus initiation (i.e., a rate of force development [RFD
Evaluation of Sex-Specific Movement Patterns in Judo Using Probabilistic Neural Networks
Bianca Miarka, Katarzyna Sterkowicz-Przybycien, and David H. Fukuda
, Brazil) was used to conduct the time-motion analysis; the study was previously approved by the local ethics and research committee. Settings Determination of Movement With Biomechanical and T-T Patterns The approach phase of combat was subdivided into four categories according to the movement pattern
Effect of Mental Calculation and Number Comparison on a Manual-Pointing Movement
Joy Khayat, Stéphane Champely, Ahmad Diab, Ahmad Rifai Sarraj, and Patrick Fargier
comparison of dot ensembles, designed in accordance with Dietrich, Huber, and Nuerk ( 2015 ), required the determination of the ensemble that contained more dots. Arithmetical operations (Experiments 1 and 2) and numbers to be compared (Experiment 3) were shown 10 s. The dot ensembles to be compared
