کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6271113 | 1614748 | 2016 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
On the nature of motor planning variables during arm pointing movement: Compositeness and speed dependence
ترجمه فارسی عنوان
در ماهیت متغیرهای برنامه ریزی موتور در طی حرکت بازو: کامپوزیت و وابستگی به سرعت
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
OCPDoFIOCNLPDegrees-of-freedomMotor planning - برنامه ریزی موتورArm movement - جنبش بازوCNS - دستگاه عصبی مرکزیSpeed-dependence - سرعت وابستگیcentral nervous system - سیستم عصبی مرکزیNonlinear programming problem - مشکل برنامه نویسی غیر خطیOptimal control problem - مشکل کنترل بهینهOptimal control - کنترل بهینهInverse optimal control - کنترل بهینه معکوس
موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
علوم اعصاب (عمومی)
چکیده انگلیسی
The purpose of this study was to investigate the nature of the variables and rules underlying the planning of unrestrained 3D arm reaching. To identify whether the brain uses kinematic, dynamic and energetic values in an isolated manner or combines them in a flexible way, we examined the effects of speed variations upon the chosen arm trajectories during free arm movements. Within the optimal control framework, we uncovered which (possibly composite) optimality criterion underlays at best the empirical data. Fifteen participants were asked to perform free-endpoint reaching movements from a specific arm configuration at slow, normal and fast speeds. Experimental results revealed that prominent features of observed motor behaviors were significantly speed-dependent, such as the chosen reach endpoint and the final arm posture. Nevertheless, participants exhibited different arm trajectories and various degrees of speed dependence of their reaching behavior. These inter-individual differences were addressed using a numerical inverse optimal control methodology. Simulation results revealed that a weighted combination of kinematic, energetic and dynamic cost functions was required to account for all the critical features of the participants' behavior. Furthermore, no evidence for the existence of a speed-dependent tuning of these weights was found, thereby suggesting subject-specific but speed-invariant weightings of kinematic, energetic and dynamic variables during the motor planning process of free arm movements. This suggested that the inter-individual difference of arm trajectories and speed dependence was not only due to anthropometric singularities but also to critical differences in the composition of the subjective cost function.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neuroscience - Volume 328, 22 July 2016, Pages 127-146
Journal: Neuroscience - Volume 328, 22 July 2016, Pages 127-146
نویسندگان
Van Hoan Vu, Brice Isableu, Bastien Berret,