1. Failure to obtain value enhancement by within-trial contrast in simultaneous and successive discriminations

   • Joana Arantes
   • Randolph C. Grace

   OriginalPaper Pages: 1 - 11

2. Deprivation level and choice in pigeons: A test of within-trial contrast

   • Marco Vasconcelos
   • Peter J. Urcuioli

   OriginalPaper Pages: 12 - 18

3. Within-trial contrast: When you see it and when you don’t

   • Thomas R. Zentall

   Comment And Reply Pages: 19 - 22

4. Certainties and mysteries in the within-trial contrast literature: A reply to Zentall (2008)

   • Marco Vasconcelos
   • Peter J. Urcuioli

   Comment And Reply Pages: 23 - 25

5. Contrast and value: Beyond the work ethic effect. A reply to Zentall (2008)

   • Joana Arantes
   • Randolph C. Grace

   Comment And Reply Pages: 26 - 28

6. Response-cost punishment with pigeons: Further evidence of response suppression via token loss

   • Bethany R. Raiff
   • Christopher E. Bullock
   • Timothy D. Hackenberg

   OriginalPaper Pages: 29 - 41

7. Rats show preference for delayed rewards on the radial maze

   • Miranda C. Feeney
   • William A. Roberts

   OriginalPaper Pages: 42 - 54

8. Required pecking and refraining from pecking alter judgments of time by pigeons

   • Thomas R. Zentall
   • Rebecca A. Singer

   OriginalPaper Pages: 55 - 61

9. Potentiation of taste and extract stimuli in conditioned flavor preference learning

   • Elizabeth D. Capaldi
   • Gregory J. Privitera

   OriginalPaper Pages: 62 - 66