[1] Univ Illinois, Dept Psychol, Champaign, IL 61820 USA
[2] Univ Illinois, Neurosci Program, Champaign, IL 61820 USA
[3] Univ Texas, Med Branch, Inst Marine Biomed, Galveston, TX 77555 USA
[4] Univ Texas, Med Branch, Dept Anat & Neurosci, Galveston, TX 77555 USA
[5] Hebrew Univ Jerusalem, Inst Life Sci, Dept Cell & Anim Biol, IL-91904 Jerusalem, Israel
[6] NIDA, Behav Neurosci Sect, Intramural Res Program, NIH, Baltimore, MD 21224 USA
[7] Oregon Hlth & Sci Univ, Dept Behav Neurosci, Portland, OR 97201 USA
[8] Oregon Hlth & Sci Univ, VA Med Ctr, Portland, OR 97201 USA
[9] Univ Maryland Baltimore Cty, Sch Med, Dept Psychiat, Maryland Psychiat Res Ctr, Baltimore, MD 21228 USA