Intermanueller Transfer und Händigkeit
Abstract
Zusammenfassung. In dem Experiment wurde der intermanuelle Transfer auf eine neue dynamische Anforderung und Händigkeit untersucht. Gegenstand ist das Lernen einer Bewegungssequenz. Die Aufgabe der Lerner bestand in dem Erwerb einer 16-Elementigen Bewegungssequenz. Nach einem anfänglichen Training einer Bewegungssequenz für Rechts- und Linkshänder in Abhängigkeit der Starthand (dominante, nicht-dominante Hand) wurden nach einem Intervall von 24 Stunden ein Behaltenstest und zwei Transfertests appliziert. In dem Behaltenstest musste die gelernte Sequenz mit der trainierten Hand ohne Zusatzlast (0 kg) reproduziert werden. In den beiden ausbalancierten Transfertests sollte sowohl mit der trainierten als auch mit der untrainierten kontralateralen Hand eine zusätzliche Masse von 1 kg bewegt werden. Die Ergebnisse zeigen, dass sowohl Rechts- als auch Linkshänder auf unterschiedliche dynamische Eigenschaften mit ihrer dominanten Hand transferieren können. Rechtshänder können sowohl mit der rechten als auch der linken Hand unabhängig von ihrer Starthand auf neue dynamische Anforderungen transferieren (Symmetrie). Eine Asymmetrie in dem Übertrag zeigt sich bei den Linkshändern, die unabhängig von ihrer trainierten Hand nicht auf ihre rechte Hand und auf eine veränderte dynamische Anforderung transferieren können.
Abstract. This experiment investigated differences in transfer to novel task dynamics in movement sequence learning and handedness. Increased loads were used to determine the transfer profiles of movement sequences to practiced and unpracticed limbs. The task required participants to move a horizontal lever to 16 sequentially projected targets. One group practiced the 16-element movement sequence with their dominant limb and another group practiced with their nondominant limb. Approximately 24 hours after completion of the acquisition session, both groups were administered three test blocks with their practiced and unpracticed limbs using the sequence practiced during acquisition. The test blocks involved unchanged (0 kg), and increased (1 kg) load with the practiced and unpracticed hand (order counterbalanced). Results of the experiment indicated that right- and left-handers were effectively able to compensate for increased loads with virtually no changes in performance characteristics with their dominant hand (pattern of element durations). Additionally, right-handers were able to transfer to their nondominant left hand and different loads (transfer symmetry). For left-handers, transfer to different loads was restricted to their dominant hand (transfer asymmetry).
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