We are grateful to acknowledge the support of the following contributors

• National Science Foundation
• National Institutes of Health
• Institute for Neuroscience at the University of Texas, Dan Johnston (Director)
• Psychology Department at the University of Texas, Michael Domjan (Chair)
• Section of Neurobiology at the University of Texas, Harold Zakon (Chair)
• College of Liberal Arts at the University of Texas, Richard Lariviere (Dean)
• College of Natural Sciences at the University of Texas, Mary Ann Rankin (Dean)
• Center for Behavioral Neuroendocrinology at the University of Texas, David Crews (Director)
• Office of Graduate Studies at the University of Texas, Victoria Rodriguez (Vice Provost and Dean)
• Office of the Dean of Students at the University of Texas, Teresa Brett (Dean)
• The University Co-Op
• Ambion, Inc.
• Brain, Behavior and Evolution, Walt Wilczynski (Editor) and Karger
• Elsevier