This study examined the effect of visual feedback and force level on the neural mechanisms responsible for the performance of a motor task. We used a voxelwise fMRI approach to determine the effect of visual feedback (with and without) during a grip force task at 35% and 70% of maximum voluntary contraction. Two areas (contralateral rostral premotor cortex and putamen) displayed an interaction between force and feedback conditions. When the main effect of feedback condition was analyzed, higher activation when visual feedback was available was found in 22 of the 24 active brain areas, while the two other regions (contralateral lingual gyrus and ipsilateral precuneus) showed greater levels of activity when no visual feedback was available. The results suggest that there is a potentially confounding influence of visual feedback on brain activation during a motor task, and for some regions, this is dependent on the level of force applied.
Jeremy W. Noble, Janice J. Eng and Lara A. Boyd
Jeremy J. Noble, Michael B. Madson, Richard S. Mohn and Jon T. Mandracchia
Heavy episodic drinking (HED) is related to an increase in negative consequences (Wechsler, Lee, Kuo, & Lee, 2000) including approximately 599,000 unintentional injuries and 1,825 deaths annually among college students (Hingson, Edwards, Heeren, & Rosenbloom, 2009). College athletes participate in greater alcohol consumption and experience more negative consequences than their nonathlete peers (Hildebrand, Johnson, & Bogle, 2001). Protective behavioral strategies (PBS) have played a significant role in reducing alcohol-related negative consequences within the college population (Martens et al., 2004). However, little is known about PBS use within specific at-risk populations such as athletes. This study aimed to identify the relationship between alcohol consumption, the use of protective behavioral strategies, and negative consequences among intercollegiate athletes. Results indicated that PBS partially mediated the relationship between alcohol consumption and negative consequences. Implications for intercollegiate athlete intervention and prevention programs are discussed as well as limitations of the study and directions for future research.