Abstract：
:Several types of continuous human movements comply with the so-called Two-Thirds Power Law (2/3-PL) stating that velocity (V) is a power function of the radius of curvature (R) of the endpoint trajectory. The origin of the 2/3-PL has been the object of much debate. An experiment investigated further this issue by comparing two-dimensional drawing movements performed in air and water. In both conditions, participants traced continuously quasi-elliptic trajectories (period T = 1.5 s). Other experimental factors were the movement plane (horizontal/vertical), and whether the movement was performed free-hand, or by following the edge of a template. In all cases a power function provided a good approximation to the V-R relation. The main result was that the exponent of the power function in water was significantly smaller than in air. This appears incompatible with the idea that the power relationship depends only on kinematic constraints and suggests a significant contribution of dynamic factors. We argue that a satisfactory explanation of the observed behavior must take into account the interplay between the properties of the central motor commands and the visco-elastic nature of the mechanical plant that implements the commands.
journal_name
Exp Brain Resjournal_title
Experimental brain researchauthors
Catavitello G,Ivanenko YP,Lacquaniti F,Viviani Pdoi
10.1007/s00221-016-4569-9subject
Has Abstractpub_date
2016-06-01 00:00:00pages
1649-57issue
6eissn
0014-4819issn
1432-1106pii
10.1007/s00221-016-4569-9journal_volume
234pub_type
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journal_title：Experimental brain research
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