About the Authors

David L. Woods

dlwoods@ucdavis.edu

Affiliations Human Cognitive Neurophysiology Laboratory, Veterans Affairs Northern California Heath Care System, 150 Muir Rd., Martinez, CA, 95553, United States of America, University of California Davis, Department of Neurology, 4860 Y St., Suite 3700, Sacramento, CA, 95817, United States of America, Center for Neurosciences, University of California Davis, 1544 Newton Ct., Davis, CA, 95616, United States of America, Center for Mind and Brain, University of California Davis, 202 Cousteau Place, Suite 201, Davis, CA, 95616, United States of America

John M. Wyma

Affiliation Human Cognitive Neurophysiology Laboratory, Veterans Affairs Northern California Heath Care System, 150 Muir Rd., Martinez, CA, 95553, United States of America

Timothy J. Herron

Affiliation Human Cognitive Neurophysiology Laboratory, Veterans Affairs Northern California Heath Care System, 150 Muir Rd., Martinez, CA, 95553, United States of America

E. William Yund

Affiliation Human Cognitive Neurophysiology Laboratory, Veterans Affairs Northern California Heath Care System, 150 Muir Rd., Martinez, CA, 95553, United States of America

Competing Interests

The author has read the journal's policy and the authors of this manuscript have the following competing interests: DLW is affiliated with NeuroBehavioral Systems, Inc., the developers of Presentation software that was used to conduct these experiments. This in no way alters the authors' commitment to sharing data.

Author Contributions

Conceived and designed the experiments: DLW EWY. Performed the experiments: EWY. Analyzed the data: DLW TJH EWY. Contributed reagents/materials/analysis tools: TJH EWY JMW. Wrote the paper: DLW JMW EWY TJH.