کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6275048 1614840 2013 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Unintended hand movements after abrupt cessation of variable and constant opposing forces
ترجمه فارسی عنوان
جنبش های ناخواسته دست پس از پایان ناگهانی نیروهای مخالف متغیر و ثابت
کلمات کلیدی
امپدانس پایه کنترل امپدانس، پیش بینی،
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب (عمومی)
چکیده انگلیسی

Humans are highly efficient in moving in a world of variable resistive forces which result, e.g., from different masses of objects or different directions of movements relative to gravity. However, the underlying mechanisms are challenged when an opposing force is suddenly removed. The resulting involuntary movements are known as accident risks in everyday life. We studied their characteristics upon abrupt cessations of opposing forces of 1, 2, and 4 N which were presented in a series of variable or constant forces. The characteristics of the involuntary hand movements are largely determined by the mechanical impedance of the limb. The involuntary movements are oscillatory in nature, and their amplitude increases with stronger opposing force. Limb impedance is modulated both in a reactive and in an anticipatory manner. The reactive modulation occurs during each involuntary movement as a consequence of the neural responses elicited by the rapid limb acceleration consequent upon the cessation of the opposing force. Anticipatory modulation of limb impedance may serve to produce similar involuntary movements in spite of different opposing forces. The modulation is thus stronger with variable forces, where differences between resulting involuntary movements can be experienced more easily, than with constant forces.

► Abrupt cessation of an opposing force triggers unintended movements. ► Characteristics of unintended movements are largely determined by limb impedance. ► Limb impedance is modulated in a reactive and an anticipatory manner. ► Anticipatory modulation is stimulated by the amplitude of the unintended movements.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neuroscience - Volume 236, 16 April 2013, Pages 271-280
نویسندگان
, ,