[Technical aspects of studying motor asymmetry].

The present review shows the variability assessing motoric asymmetries. There are preference and performance tests. Motoric asymmetries are strongest and most manifest for handedness (hand preference and performance), descending through footedness and other less known asymmetries. A vast range of testing techniques have been used to assess handedness. Writing and self-report are two of the most popular techniques. Other preference measures include observation of how people use tools and questionnaires. Performance test assess speed and accuracy in tasks stressing manipulative dexterity. Although questionnaires are generally thought to be reliable and valid instruments, there is a disagreement as to the nature, the number and weighting of the items to be included.