Changes in spatial scale in drawing and handwriting: Kinematic contributions by proximal and distal joints

F. Lacquaniti, G. Ferrigno, A. Pedotti, J. F. Soechting, C. Terzuolo

Research output: Contribution to journalArticle

Abstract

The coordination of arm and hand motions was studied in tasks involving drawing and handwriting movements of different amplitudes. To this end, pen motion was recorded by means of a digitizing table, while the positions of different markers on the limb were monitored by the ELITE system. It was found that the amplitude of shoulder and elbow angular motions scales roughly with the size of the figure drawn or of the script, whereas the amplitude of wrist and finger motions is small, independent of size. Consequently, the larger the limb movement, the smaller the magnitude of the contributions by motions at distal joints relative to that at proximal joints. Furthermore, while shoulder and elbow motions are tightly coupled (constant phase relation), motions at distal joints are loosely coupled to those at the proximal joints (variable phase relation). On the other hand, motion at distal joints increases the accuracy of the movement, as indicated by the smaller variability of pen trajectories compared to that of wrist trajectories.

Original languageEnglish
Pages (from-to)819-828
Number of pages10
JournalJournal of Neuroscience
Volume7
Issue number3
Publication statusPublished - 1987

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Handwriting
Biomechanical Phenomena
Joints
Elbow
Wrist
Extremities
Fingers
Arm
Hand

ASJC Scopus subject areas

  • Neuroscience(all)

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Changes in spatial scale in drawing and handwriting : Kinematic contributions by proximal and distal joints. / Lacquaniti, F.; Ferrigno, G.; Pedotti, A.; Soechting, J. F.; Terzuolo, C.

In: Journal of Neuroscience, Vol. 7, No. 3, 1987, p. 819-828.

Research output: Contribution to journalArticle

Lacquaniti, F. ; Ferrigno, G. ; Pedotti, A. ; Soechting, J. F. ; Terzuolo, C. / Changes in spatial scale in drawing and handwriting : Kinematic contributions by proximal and distal joints. In: Journal of Neuroscience. 1987 ; Vol. 7, No. 3. pp. 819-828.
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