negative contrast effect
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2020 ◽  
Vol 69 ◽  
pp. 101615
Author(s):  
Juan Carlos Ruiz-Salas ◽  
L. Gonzalo de la Casa ◽  
Mauricio R. Papini


2015 ◽  
Vol 232 (15) ◽  
pp. 2697-2709 ◽  
Author(s):  
C. E. Phelps ◽  
E. N. Mitchell ◽  
D. J. Nutt ◽  
H. M. Marston ◽  
E. S. J. Robinson


2012 ◽  
Vol 22 ◽  
pp. S40
Author(s):  
E.N. Mitchell ◽  
H. Marston ◽  
D.J. Nutt ◽  
E.S.J. Robinson


2007 ◽  
Vol 185 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Juan Manuel Rosas ◽  
José Enrique Callejas-Aguilera ◽  
Mª Dolores Escarabajal ◽  
Mª José Gómez ◽  
Lourdes de la Torre ◽  
...  


2004 ◽  
Vol 94 (2) ◽  
pp. 683-686 ◽  
Author(s):  
Richard S. Calef ◽  
Michael C. Choban ◽  
Katherine R. Glenney ◽  
Ruth A. Calef ◽  
Errika M. Mace ◽  
...  

During preshift, one experimental group of rats was given a large magnitude of food reward following a traversal of a straight alley and during a goalbox placement, while the other experimental group was given a small reward during goalbox placement and a large reward following a run. During postshift, all experimental groups were given a small reward of food following a traversal down the runway and during a goalbox placement. A control group was maintained on small reward during placements and following a traversal throughout the study. Only the group who received preshift large reward during placement and following a runway response ran slower to small reward during postshift than the control group maintained on small reward (negative contrast effect).



1992 ◽  
Vol 3 (Supplement) ◽  
pp. 46
Author(s):  
A MORALES ◽  
M C TORRES ◽  
J L MEGIAS ◽  
A CANDIDO ◽  
A MALDONADO


1981 ◽  
Vol 49 (1) ◽  
pp. 335-338 ◽  
Author(s):  
David T. Goomas

Three groups of 5 rats were administered either large reward (10 pellets), small reward (2 pellets), or multiple shifts (Iarge-small-large-etc.) in an alleyway. The multiple-shift group received a total of 7 large and 6 small phases of reinforcement. Early in training the shifted group exhibited positive contrast effect to a shift to large reward and negative contrast effect to a shift to small reward. Later in training, the same group showed neither effect perhaps because experience with the shift provided a smaller discrepancy between the upshifts and downshifts in magnitude of reward.



1979 ◽  
Vol 45 (1) ◽  
pp. 219-222
Author(s):  
David T. Goomas

In a repeated-shifts study, a negative contrast effect was obtained when a group of rats was shifted from 0- to 20-sec. delayed food reward only in the first, but not the second, shift. No positive contrast effect was obtained in either shift when a group of rats was shifted from 20- to 0-sec. delayed food reward. Shifts in delay are not repeatedly effective in inducing negative contrast and not effective at all in inducing positive contrast.





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