1. Editorial

   • Robert C. Bolles

   EditorialNotes Pages: 1 - 1

2. Control of pigeons’ keypecking by the left-right arrangement of stimuli

   • Donald M. Wilkie
   • Marcia L. Spetch
   • Leslie G. Leader

   OriginalPaper Pages: 2 - 8

3. Auditory delayed discriminations by the dolphin: Nonequivalence with delayed-matching performance

   • Roger K. R. Thompson
   • Louis M. Herman

   OriginalPaper Pages: 9 - 15

4. Facilitating stimulus effects of reward and punishment in discrimination learning

   • H. Fowler
   • M. Hochhauser
   • G. J. Wischner

   OriginalPaper Pages: 16 - 20

5. Effects of stimulus change in prepunishment alley segments on self-punitive behavior

   • Stephen T. Perconte
   • Betsey A. Benson
   • David L. Butler

   OriginalPaper Pages: 21 - 27

6. Influence of duration and number of inescapable shocks on intrashock activity and subsequent interference effects

   • Charles R. Crowell
   • D. Chris Anderson

   OriginalPaper Pages: 28 - 37

7. Electroconvulsive shock and learned helplessness in rats

   • C. W. Brett
   • Thomas A. Burling
   • W. B. Pavlik

   OriginalPaper Pages: 38 - 44

8. Acquisition and retention of dark avoidance by the toad,Xenopus laevis (Daudin)

   • Ilan Karplus
   • Daniel Algom
   • David Samuel

   OriginalPaper Pages: 45 - 49

9. Activity differences of individually and group-housed male and female rats

   • J. C. Dalrymple-Alford
   • D. Benton

   OriginalPaper Pages: 50 - 55

10. The effects of separate presentations of the US on conditioned suppression

    • A. Randich
    • R. A. Rescorla

    OriginalPaper Pages: 56 - 64

11. One-trial backward excitatory fear conditioning in rats: Acquisition, retention, extinction, and spontaneous recovery

    • David Shurtleff
    • John J. B. Ayres

    OriginalPaper Pages: 65 - 74

12. Measurement of current flow through the rat under signaled and unsignaled grid-shock conditions

    • Hiroshi Imada
    • Tetsuro Mino
    • Yuji Ohki

    OriginalPaper Pages: 75 - 79

13. Classically conditioned tail flexion in rats: CR-contingent modification of US intensity as a test of the preparatory response hypothesis

    • Ralph R. Miller
    • Carolyn Greco
    • Michael Vigorito

    OriginalPaper Pages: 80 - 88

14. Neophobias and conditioned taste aversions in rats following exposure to novel flavors

    • Ralph R. Miller
    • Arnold D. Holzman

    OriginalPaper Pages: 89 - 100

15. Strain-dependent sexual dimorphism in the extinction of conditioned taste aversion in mice

    • Donald K. Ingram
    • Timothy P. Corfman

    OriginalPaper Pages: 101 - 107

16. A comparison of resistance to satiation and resistance to extinction

    • Elizabeth D. Capaldi
    • David E. Myers
    • T. L. Davidson

    OriginalPaper Pages: 108 - 114

17. Multiple-schedule interactions and discrimination

    • David W. Rowe
    • John C. Malone

    OriginalPaper Pages: 115 - 126

18. Comparative performance in discrimination learning tasks in two New World primates (Saimiri sciureus andCallicebus moloch)

    • Dorothy Munkenbeck Fragaszy

    OriginalPaper Pages: 127 - 134

19. Object permanence in cats and dogs

    • Estrella Triana
    • Robert Pasnak

    OriginalPaper Pages: 135 - 139

20. Mouse (Mus) burrows: Effects of age, strain, and domestication

    • Nelson Adams
    • Robert Boice

    OriginalPaper Pages: 140 - 144

21. Tonic immobility in Japanese quail can reduce the probability of sustained attack by cats

    • R. K. R. Thompson
    • R. W. Foltin
    • C. E. Lowitz

    OriginalPaper Pages: 145 - 149

22. Comment on Brain, Benton, Howell, and Jones: “Resident rats’ aggression toward intruders”

    • D. H. Thor

    Notes and Comment Pages: 150 - 151