Measurement of the complex dielectric constant down to helium temperatures. II. Quasi-optical technique from 0.03 to 1 THz

Metals in Catalysis, Biomimetics & Inorganic Material

Low elementary movement speed is associated with poor motor skill in Turner syndrome

Item does not contain fulltextThe article aims at discriminating between two features that in principle both may be characteristic of the frequently observed poor motor performance in girls with Turner Syndrome (TS). On the one hand, a reduced movement speed that is independent of variations in spatial accuracy demands and therefore suggestive of a problem in motor execution, on the other hand a disproportional slowing down of movement speed under spatial-accuracy demands, indicating a more central problem in motor programming. To assess their motor performance problems 15 girls with TS (age 9.6 -13.0 years) and 14 female controls (age 9.1-13.0 years) were tested using the Movement Assessment Battery for Children (MABC). Additionally, an experimental procedure using a variant of Fitts' graphical aiming task was used to try and disentangle the role of spatial-accuracy demands in different motor task conditions. The results of the MABC re-establish that overall motor performance in girls with TS is poor. The data from the Fitts' task reveal that TS girls move with the same accuracy as their normal peers but show a significantly lower speed, independent of task difficulty. We conclude that a problem in motor execution is the main factor determining performance differences between girls with TS and controls