Retraining motor control used to be a commonly accepted procedure in schools, which demanded all left-handed children to change handedness regardless of the possible consequences. The aim of this thesis is to elicit whether retraining motor control has an impact on human cognition and to what extent other motor skills or bodily asymmetries are effected. Furthermore, the thesis also means to look into the heredity of left-handedness. In order to investigate the fields of interest, a total of three research questions have been compiled namely: Whether retrained motor control affects cognition; whether retraining motor control also influences other motor skills as well as bodily asymmetries and whether there is an apparent connection between genetics and the handedness of the participants examined. A five task survey has been conducted to primarily evaluate the participants drawing and writing abilities i.e. motor skills, to determine their handedness according to the Edinburgh Handedness Inventory and to look into the primary and secondary consequences according to Sattler i.e. cognitive aspects. The study only concentrates on seven participants which have been retrained and can therefore be regarded as a case study. As a result of the survey, all participants showed that they were affected by being retrained and even though the participants still follow through the majority of tasks with their left hand, there are some tasks which have been assigned to the right side of their body. Apart from that a connection between heredity and handedness could be found. To conclude, the findings clearly offer insight to what extent retraining motor control can influence not only cognition, but also other motor skills as such. Consequently, the abolition of this procedure was a step in the right direction.