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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/7758

Title: Hierarchical organization of the coordinative structure of the skill of clay kneading
Authors: Yamamoto, Tomoyuki
Fujinami, Tsutomu
Keywords: motor skills
motor control
development
synchronization
differentiation
Issue Date: 2008-10
Publisher: Elsevier
Magazine name: Human Movement Science
Volume: 27
Number: 5
Start page: 812
End page: 822
DOI: 10.1016/j.humov.2008.07.001
Abstract: An experiment was conducted to study the skill of clay kneading in pottery. This task usually requires a few years to master and is therefore well suited to study the long-term development of a complex motor skill. Participants’ kneading movements were measured in 3D using a motion capture device and phase relations among coordinates and joint angles were analyzed in terms of the mutual phase relative to a reference point using the Hilbert transform. While a certain degree of periodicity was observed in all ten participants, the behavior of the experts was characterized by a significant delay for the right elbow (i.e., the pushing arm) and the fore-aft position of the upper torso and only brief delays for the other parts, which all tended to synchronize with the reference. These findings are consistent with our notion of “differentiation within coordination”, according to which skill learning proceeds in a hierarchical manner in that coordination among limb movements is established first, followed by modulations of specific limb movements within the established coordination. Although this feature of expert behavior was also apparent in our previous studies of clay kneading and samba performances, the numbers of participants in those studies were not sufficient to draw firm conclusions. Since the present study involved more participants and a superior method of analysis, the present evidence for the principle of differentiation within coordination is more conclusive.
Rights: NOTICE: This is the author's version of a work accepted for publication by Elsevier. Tomoyuki Yamamoto, Tsutomu Fujinami, Human Movement Science, 27(5), 2008, 812-822, http://dx.doi.org/10.1016/j.humov.2008.07.001
URI: http://hdl.handle.net/10119/7758
Material Type: author
Appears in Collections:a10-1. 雑誌掲載論文 (Journal Articles)

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