The present study revisited the issue whether the presence of added visual feedback differentially affects the accuracy of finger and jaw movements. 15 men were instructed to move either the index finger on the dominant (right) hand, or the jaw, to a predefined target position with the highest precision possible. During ex- ecution of the task, on-line visual feedback of the moving articulator was either pres- ent or removed Zn contrast to previous findings, significant improvement was ob- served for both f~ngcr and jaw movements in the visual feedback condition. Move- ment error in the nonv~sual condition was propordonally greater for finger than for jaw movements which may have reflected a speed-accuracy trade-off because finger movements in the nonvisual condition were executed significandy faster than those of the jaw. The present findings support the beneficial effects of adding visual feedback during dynamic oral and figer movements that require a high spatial precision. Such findings support current methods of clinical intelvention in speech-language pathology and other disciplines. Furthermore, the results contribute to our understanding of the role of various modalities of feedback during motor execution.
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