1. Glutamate: its role in learning, memory, and the aging brain

   • William J. McEntee
   • Thomas H. Crook

   Review Pages: 391 - 401

2. Phencyclidine-induced potentiation of brain stimulation reward: acute effects are not altered by repeated administration

   • William A. Carlezon Jr
   • Roy A. Wise

   Original Investigations Pages: 402 - 408

3. Oral etonitazene and cocaine consumption by AA, ANA and Wistar rats

   • P. Hyyatiä
   • J. D. Sinclair

   Original Investigations Pages: 409 - 414

4. Pharmacological characterization of benzodiazepine receptor ligands with intrinsic efficacies ranging from high to zero

   • James R. Martin
   • Peter Schoch
   • Willy E. Haefely

   Original Investigations Pages: 415 - 422

5. Involvement of δ-opioid receptors in the effects of morphine on locomotor activity and the mesolimbic dopaminergic system in mice

   • Minoru Narita
   • Tsutomu Suzuki
   • Hiroshi Nagase

   Original Investigations Pages: 423 - 426

6. Effects of dopamine D₁ and D₂ receptor blockade on MK-801-induced hyperlocomotion in rats

   • A. Ouagazzal
   • A. Nieoullon
   • M. Amalric

   Original Investigations Pages: 427 - 434

7. Attenuation of scopolamine-induced spatial memory deficits in the rat by cholinomimetic and non-cholinomimetic drugs using a novel task in the 12-arm radial maze

   • Robert P. Dennes
   • Julie C. Barnes

   Original Investigations Pages: 435 - 441

8. Mnemogenic effects of injecting RA-octil, a CE-inhibitor derivate, systemically or into the basal forebrain

   • P. Gerhardt
   • R. U. Hasenöhrl
   • J. P. Huston

   Original Investigations Pages: 442 - 448

9. Physical dependence on nicotine gum: effect of duration of use

   • Dorothy Hatsukami
   • Marguerite Huber
   • Kelli Skoog

   Original Investigations Pages: 449 - 456

10. Reduction of morphine dependence and potentiation of analgesia by chronic co-administration of nifedipine

    • Lucyna Antkiewicz-Michaluk
    • Jerzy Michaluk
    • Jerzy Vetulani

    Original Investigations Pages: 457 - 464

11. Contrasting effects of the competitive NMDA antagonist CPP and the non-competitive NMDA antagonist MK 801 on performance of an operant delayed matching to position task in rats

    • B. J. Cole
    • M. Klewer
    • D. N. Stephens

    Original Investigations Pages: 465 - 471

12. Effects of smoking on thermal pain threshold in deprived and minimally-deprived habitual smokers

    • Paul Pauli
    • Harald Rau
    • Niels Birbaumer

    Original Investigations Pages: 472 - 476

13. Immobilization stress-induced oral opioid self-administration and withdrawal in rats: role of conditioning factors and the effect of stress on “relapse” to opioid drugs

    • Yavin Shaham

    Original Investigations Pages: 477 - 485

14. Investigation of the involvement of opioid receptors in the action of anticonvulsants

    • Helen C. Jackson
    • D. J. Nutt

    Original Investigations Pages: 486 - 490

15. Trial 2 in the elevated plus-maze: a different form of fear?

    • Sandra E. File
    • Helio Zangrossi Jr
    • Frederico G. Graeff

    Original Investigations Pages: 491 - 494

16. Seizure threshold to lidocaine is decreased following repeated ECS (electroconvulsive shock)

    • Jørn Kragh
    • Jakob Seidelin
    • Tom G. Bolwig

    Original Investigations Pages: 495 - 498

17. Acute stress or corticosterone administration reduces responsiveness to nicotine: implictions for a mechanism of conditioned tolerance

    • Anthony R. Caggiula
    • Leonard H. Epstein
    • Richard Stiller

    Original Investigations Pages: 499 - 507

18. Chronic treatments with cholinoceptor drugs influence spatial learning in rats

    • F. A. Abdulla
    • M. -R. Calaminici
    • J. D. Sinden

    Rapid Communication Pages: 508 - 511