Depending on perceived valence (i.e. positive or negative), feedback may disrupt motor automatization, but can help to improve performance. I assume positive feedback valence to improve performance precision, as well as to support motor automatization.This hypothesis was tested on 56 participants, practicing an elbow-extension-flexion-sequence on 5 days of partice (in total 720 trials). Error feedback was provided on 14% of the trials (active control-group). In three groups, feedback valence was induced by normative feedback: Systematically manipulated reference lines in a visual feedback display, indicated performance of a putative peer-group either to be superior (negative valence, NEG14), or inferior (POS100 and POS14) to participants actual performance. A dual-task-test was conducted to operationalize automatization. A passive control-group was included to control for alternative explanations for dual-task cost reduction.The results show, that normative feedback has a dissociative effect on automaticity and precision: Dual-task costs decreased only in the POS14. Precision improved just in the NEG14. Thus positive feedback valence appears to facilitate motor automatization, as predicted, while unexpectedly, only negative feedback valence seems to improve movement precision. These effects may be modulated by motivational factors.