The dynamics of coordinated reaching and grasping: Scanning prehension properly |
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| Authors: | Frank T J M Zaal Reinoud J Bootsma |
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| Institution: | a Faculty of Human Movement Sciences, Vrije Universiteit, Van der Boechorststraat 9, 1081 BT Amsterdam, Netherlands;b Institute for Fundamental and Clinical Human Movement Sciences, Amsterdam/Nijmegen, Netherlands;c Mouvement & Perception, University of the Mediterranean, Marseilles, France;d Centre National de Recherche Scientifique, Marseilles, France |
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| Abstract: | Prehension is the act of coordinated reaching and grasping. S.A. Wallace, E. Stevenson, A. Spear, D.L. Weeks Hum. Movement Sci. 13 (1994) 255–289] proposed to assess the stability of this coordination by scanning the dynamics of prehension. The scanning method proposed by these authors prompted participants to position their peak hand aperture at different locations along the trajectory. Comparing the actual performance with the required performance, Wallace and colleagues concluded that there was a single stable pattern of coordination, albeit different for each individual. Here, we show that the method developed by Wallace et al. (1994, loc. cit.), and later used by C. Button, S. Bennett, K. Davids Hum. Movement Sci. 17 (1998) 801–820] was flawed. We propose two potential fixes to the method and report a replication of the original experiment. Interpretation of the data with a corrected scanning technique showed that the method does not seem to be able to result in an unambiguous and precise assessment of the locus of stability. |
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| Keywords: | Prehension Motor coordination Coordination dynamics Scanning technique |
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