Differences in Some Aspects of Co-Ordination Between the Twin and Single-Born Subjects

In this paper an attempt is made to measure the intra-pair differences in performance of monozygotic (MZ) twins, and to compare them with single-born subjects of the same gender and age. Thirty right-handed, male subjects aged 21, were divided into two subgroups: monozygotic twins subgroup of 6 subjects and a control group of 24 single-born subjects. The hand dominance of each subject was established by means of a questionnaire (selection from Edinburgh Handedness Inventory) and verified by simple motor tasks. Self reported hand dominance was also recorded. The level of psychomotor performance of each subject was evaluated by the use of chosen tests from the computerized Vienna Test System (VST, Vienna, Austria). The experiment showed differences in some aspects of co-ordination between twin and single-born subjects, with the majority of tasks showing an advantage with single-born subjects. The motor control of MZ twins seems to differ from single-born subjects in some aspects, and thus, it needs further scientific research.