Performance Monitoring by Pre - Supplementary and 3 Supplementary Motor Area during an Arm Movement 4 Countermanding Task

6 Katherine W. Scangos, Ryan Aronberg, & Veit Stuphorn 7 8 Department of Neuroscience, Johns Hopkins University School of Medicine and Zanvyl Krieger 9 Mind/Brain Institute, Baltimore, MD, USA 10 11 Undergraduate Neuroscience Program, Johns Hopkins University, Baltimore, MD, USA 12 13 Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, MD, 14 USA 15 16 17 Abbreviated title: SMA evaluates countermanding performance 18 19 20 Address for correspondence: 21 Veit Stuphorn 22 Johns Hopkins University 23 338 Krieger Hall 24 3400 N. Charles St. 25 Baltimore, MD 21218 26 USA 27 Tel: (410) 516-7964 28 Fax: (410) 516-8648 29 Email: [email protected] 30 31 10 figures 32 1 table 33 Number of pages: 38 34 35 36 37 38 39 40 Acknowledgements: We are grateful to J.D.Schall and L. Boucher for comments on the 41 manuscript. This work was supported by the National Eye Institute through grant R0142 EY019039 to VS 43 Articles in PresS. J Neurophysiol (January 16, 2013). doi:10.1152/jn.00688.2012