1. Alcohol pretreatment increases preference for cocaine over monetary reinforcement

   • S. T. Higgins
   • J. M. Roll
   • W. K. Bickel

   Original Investigation Pages: 1 - 8

2. Effects of scopolamine on learning and memory in monkeys

   • U. C. Savage
   • W. B. Faust
   • J. M. Moerschbaecher

   Original Investigation Pages: 9 - 14

3. Enhancement of cocaine's abuse liability in methadone maintenance patients

   • K. L. Preston
   • K. L. Preston
   • K. L. Preston

   Original Investigation Pages: 15 - 25

4. Temporal relationships between the pharmacokinetics of methylphenidate in the human brain and its behavioral and cardiovascular effects

   • N. D. Volkow
   • G. -J. Wang
   • J. Lieberman

   Original Investigation Pages: 26 - 33

5. Effects of drug history on the acquisition of responding maintained by GBR 12909 in rhesus monkeys

   • F. H. E. Wojnicki
   • J. R. Glowa

   Original Investigation Pages: 34 - 41

6. Circadian rhythm in the response of central 5-HT_1A receptors to 8-OH-DPAT in rats

   • Jian-Qiang Lu
   • Haruo Nagayama

   Original Investigation Pages: 42 - 45

7. Reversal of overshadowing in a drug mixture discrimination in rats

   • J. -A. W. White
   • I. P. Stolerman

   Original Investigation Pages: 46 - 54

8. Nicotine effects on adults with attention-deficit/hyperactivity disorder

   • E. D. Levin
   • C. K. Conners
   • J. March

   Original Investigation Pages: 55 - 63

9. Adenosine receptor agonists attenuate and adenosine receptor antagonists exacerbate opiate withdrawal signs

   • G. B. Kaplan
   • M. T. Sears

   Original Investigation Pages: 64 - 70

10. Effects of morphine, naloxone and their interaction in the learned-helplessness paradigm in rats

    • A. Besson
    • A. M. Privat
    • A. Eschalier

    Original Investigation Pages: 71 - 78

11. Smoked cocaine self-administration in females

    • S. A. Dudish
    • D. K. Hatsukami
    • P. R. Pentel

    Original Investigation Pages: 79 - 87

12. Acute and chronic nicotine effects on working memory in aged rats

    • E. D. Levin
    • D. Torry

    Original Investigation Pages: 88 - 97

13. Potentiation of the effects of raclopride on sucrose consumption by the 5-HT2 antagonist ritanserin

    • A. M. J. Montgomery
    • A. Suri

    Original Investigation Pages: 98 - 102

14. Effect of destruction of the 5-hydroxytryptaminergic pathways on the acquisition of temporal discrimination and memory for duration in a delayed conditional discrimination task

    • S. S. A. Al-Zahrani
    • M. -Y. Ho
    • E. Szabadi

    Original Investigation Pages: 103 - 110