1. The preference of rats for free or response-produced food

   • David Hothersall
   • Diane Huey
   • Karen Thatcher

   OriginalPaper Pages: 241 - 243

2. Experiential factors in the enhancement of saccharin intake after shifts to water

   • Kermit T. Hoyenga
   • Katharine Blick Hoyenga

   OriginalPaper Pages: 244 - 246

3. Conditioned suppression of a VI baseline using a two-bar multiple VI shock-avoidance schedule

   • Judy Lewis

   OriginalPaper Pages: 247 - 250

4. Biphasicity of the time-response curve and amnesic effect of electroconvulsive shock in passive avoidance conditioning

   • Francesco Robustelli
   • Anne Geller
   • Murray E. Jarvik

   OriginalPaper Pages: 251 - 253

5. Behavioral components of shock-induced aggression in ground squirrels (Citellus tridecemlineatus)

   • Jim L. Turner
   • Robert Boice
   • Patrick C. Powers

   OriginalPaper Pages: 254 - 262

6. Vocalization as an objective measure of shock-elicited social aggression in rats

   • Donald H. Thor
   • William B. Ghiselli
   • Lloyd D. Wilson

   OriginalPaper Pages: 263 - 267

7. The development of self-reinforcing running in satiated rats

   • Luci Paul
   • Frank Calabrese

   OriginalPaper Pages: 268 - 272

8. Effect of number of trials, interstimulus interval, and dishabituation during CS habituation on subsequent conditioning in a CER paradigm

   • Alma E. Lantz

   OriginalPaper Pages: 273 - 277

9. Sex differences in rats’ stationary-cage activity measured by observation and automatic recording

   • P. A. Russell

   OriginalPaper Pages: 278 - 282

10. Simultaneous and successive contrast with delay of reward

    • N. J. Mackintosh
    • Janet Lord

    OriginalPaper Pages: 283 - 286

11. Cues for spontaneous alternation by gerbils

    • William N. Dember
    • Rudite Kleinman

    OriginalPaper Pages: 287 - 289

12. Several factors influencing web-spinning activity in the common house spiderAchaearanea tepidariorum Koch

    • O. J. Lien
    • G. J. Fitzgerald

    OriginalPaper Pages: 290 - 292

13. Effects of extended fixed-interval training on reversed scallops

    • Harry J. Caplan
    • John Karpicke
    • Mark Rilling

    OriginalPaper Pages: 293 - 296

14. Postdiscrimination generalization as a function of interresponse time

    • K. Geoffrey White

    OriginalPaper Pages: 297 - 301

15. Visual reinforcement: Operant acquisition in the presence of a free mirror

    • Ronald Baenninger
    • Rochelle A. Mattleman

    OriginalPaper Pages: 302 - 306

16. Effects of stimulus alternations on extinguishing a discrimination

    • James H. McCroskery
    • Patricia M. Olsen
    • Julia Wallace

    OriginalPaper Pages: 307 - 311

17. Some behavioral differences between wild and domestic Norway rats: Gnawing and platform jumping

    • Edward O. Price

    OriginalPaper Pages: 312 - 316

18. Conditioning in garter snakes: Aversion to palatable prey induced by delayed illness

    • Gordon M. Burghardt
    • Hardy C. Wilcoxon
    • James A. Czaplicki

    OriginalPaper Pages: 317 - 320