1. Social interaction between drugged and undrugged rats

   • Sandra E. File
   • J. H. Pope

   OriginalPaper Pages: 161 - 164

2. Effects of auditory stress on grooming dominance in the rat

   • Irwin M. Spigel
   • Tennys McDonald

   OriginalPaper Pages: 165 - 167

3. A concurrent assessment of the positive and negative properties of a signaled shock schedule

   • John Harsh
   • Pietro Badia

   OriginalPaper Pages: 168 - 172

4. An incentive effect in thermally motivated behavior

   • T. James Matthews
   • Seth D. Pinsky
   • Richard Strax

   OriginalPaper Pages: 173 - 176

5. Functional differences between two shock-induced aggressive behaviors of mice

   • Ross Legrand
   • Gregory Dahl
   • Susan Meier

   OriginalPaper Pages: 177 - 180

6. Learning of the insoluble conditional reaction problem by rhesus monkeys

   • Steven F. Flagg

   OriginalPaper Pages: 181 - 184

7. Comparative studies of the preference for free vs response-produced reinforcers

   • Robert W. Powell

   OriginalPaper Pages: 185 - 188

8. Two independent effects of variation in intertrial interval upon leverpress avoidance learning by rats

   • R. G. M. Morris

   OriginalPaper Pages: 189 - 192

9. Effects of the correlation between a positive and negative US on conditioned suppression in rats

   • M. F. Dearing
   • A. Dickinson
   • R. G. M. Morris

   OriginalPaper Pages: 193 - 195

10. Facilitation of licking by response-contingent electric shock

    • Karen Hartlep
    • Gregory Bertsch

    OriginalPaper Pages: 196 - 198

11. Magnitude of fear as a function of expected time to all aversive event

    • J. D. LaBarbera
    • Russell M. Church

    OriginalPaper Pages: 199 - 202

12. Autoshaping in the rhesus monkey

    • David G. Likely

    OriginalPaper Pages: 203 - 206

13. Repeated failures in reducing rat’s spontaneous alternation through the intertrial disruption of spatial orientation

    • Paul M. Bronstein
    • Terry Dworkin
    • F. Dmitri Wolkoff

    OriginalPaper Pages: 207 - 209

14. Maintenance of observing responses with the less highly valued stimulus in pigeons

    • Stephen B. Kendall

    OriginalPaper Pages: 210 - 214

15. Conditional discrimination in the goldfish

    • David C. Zuckerman
    • Donald S. Blough

    OriginalPaper Pages: 215 - 217

16. Angle between choice alleys as a critical factor in spontaneous alternation

    • Robert J. Douglas
    • Denis Mitchell
    • Robert Del Valle

    OriginalPaper Pages: 218 - 220

17. Partial reward and positive contrast effects

    • Robert Lehr

    OriginalPaper Pages: 221 - 224

18. Active- and passive-avoidance learning in inbred mice: Transfer of training effects

    • Richard L. Sprott
    • Karen L. Stavnes

    OriginalPaper Pages: 225 - 228

19. The “disinhibition” of extinguished operant behavior in pigeons: Trial-tempo shifts and novel stimulus effects

    • Eliot Hearst
    • Stanley R. Franklin
    • Conrad G. Mueller

    OriginalPaper Pages: 229 - 237

20. Evidence of color vision in a diurnal prosimian,Lemur catta

    • Ronald F. Mervis

    OriginalPaper Pages: 238 - 240