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Impact forces cannot explain the one-target advantage in rapid aimed hand movements
BIEGSTRAATEN M; SMEETS JBJ; BRENNER E
HUM MOV SCI , 2003, vol. 22, n° 3, p. 365-76 Doc n°: 110744 Localisation : Documentation IRR Descripteurs : DD82 - EXPLORATION EXAMENS BILANS - MAIN-DOIGTS A pointing movement is executed faster when a subject is allowed to stop at the first target than when the subject has to proceed to a second target ("one-target advantage"). Our hypothesis was that this is because the impact at the target helps to stop the finger when the finger does not have to proceed to a second target. This hypothesis would predict that the horizontal force at contact with the first target should be larger when there is only one-target. Modelling smooth movements with larger forces at contact using a minimum-jerk model, shows that the peak velocity is slightly higher and it occurs later during the movement when there is only one target. Although the one-target advantage was present in our experiment, the horizontal force at contact in the one-target condition was not larger than in the two-target condition. The time of the maximum velocity did not differ, but the maximum velocity was higher in the one-target condition. Thus our hypothesis is rejected, favouring a non-mechanical explanation of the one-target advantage. Langue : ANGLAIS Tiré à part : OUI Identifiant basis : 2003228846 |
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