1. The biological, social and clinical bases of drug addiction: commentary and debate

   • J. Altman
   • B. J. Everitt
   • G. D. Phillips

   Review Pages: 285 - 345

2. Sex differences in plasma cocaine levels and subjective effects after acute cocaine administration in human volunteers

   • S. E. Lukas
   • M. Sholar
   • J. H. Mendelson

   Original Investigation Pages: 346 - 354

3. Combined effects of buprenorphine and a nondrug alternative reinforcer on IV cocaine self-administration in rats maintained under FR schedules

   • S. D. Comer
   • S. T. Lac
   • M. E. Carroll

   Original Investigation Pages: 355 - 360

4. Parametric analysis of cocaine self-administration under a progressive-ratio schedule in rhesus monkeys

   • J. K. Rowlett
   • W. L. Woolverton
   • M. S. Kleven

   Original Investigation Pages: 361 - 370

5. Interaction of expectancy and the pharmacological effects ofd-amphetamine: subjective effects and self-administration

   • S. H. Mitchell
   • C. L. Laurent
   • H. de Wit

   Original Investigation Pages: 371 - 378

6. Withdrawal from oral cocaine in rats: ultrasonic vocalizations and tactile startle

   • K. A. Miczek
   • H. M. T. Barros

   Original Investigation Pages: 379 - 384

7. Effects of opioid and dopamine receptor antagonists on relapse induced by stress and re-exposure to heroin in rats

   • Y. Shaham
   • J. Stewart

   Original Investigation Pages: 385 - 391

8. Changes in “withdrawal symptoms” following discontinuation of low-dose diazepam

   • P. Hayward
   • J. Wardle
   • J. Gray

   Original Investigation Pages: 392 - 397

9. Inhibition of nitric oxide formation reduces voluntary ethanol consumption in the rat

   • G. Calapai
   • G. Mazzaglia
   • M. Di Rosa

   Original Investigation Pages: 398 - 401