Abstract
Pigeons were exposed to four cycles per session of a multiple schedule in which each cycle involved twelve 60-sec fixed intervals followed by four 180-sec intervals [(12 FI 60-sec)(4 FI 180-sec) schedule]. Post-reinforcement pauses were shorter during the first few short intervals of each cycle than during later short intervals, and increased over the four long intervals of each cycle (positive and negative transient contrast). A (12 FI 15-sec)(4 FI 45-sec) schedule showed similar results. These two schedules differed in some other respects indicating effects of absolute FI duration on stimulus control. Differences in contrast properties between both these procedures and multiple variable-interval schedules were related to the pause-producing property of reinforcement on FI (temporal inhibition). Behavior under two other multiple fixed-interval schedules—(2 FI 360-sec)(1 FI 720-sec) and (3 FI 360-sec)(1 FI 720-sec)—differed in certain respects from both the (12 FI x-sec)(4 FI 3x-sec) schedules. These differences may be related to differences in the number of successive fixed intervals within a component (run length).
Full text
PDF
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Bernheim J. W., Williams D. R. Time-dependent contrast effects in a multiple schedule of food reinforcement. J Exp Anal Behav. 1967 May;10(3):243–249. doi: 10.1901/jeab.1967.10-243. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Nevin J. A., Shettleworth S. J. An analysis of contrast effects in multiple schedules. J Exp Anal Behav. 1966 Jul;9(4):305–315. doi: 10.1901/jeab.1966.9-305. [DOI] [PMC free article] [PubMed] [Google Scholar]
- STADDON J. E. SOME PROPERTIES OF SPACED RESPONDING IN PIGEONS. J Exp Anal Behav. 1965 Jan;8:19–27. doi: 10.1901/jeab.1965.8-19. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Staddon J. E. Attention and temporal discrimination: factors controlling responding under a cyclic-interval schedule. J Exp Anal Behav. 1967 Jul;10(4):349–359. doi: 10.1901/jeab.1967.10-349. [DOI] [PMC free article] [PubMed] [Google Scholar]