scholarly journals FOOD-DEPRIVATION LEVEL ALTERS THE EFFECTS OF MORPHINE ON PIGEONS' KEY PECKING

1998 ◽  
Vol 69 (3) ◽  
pp. 295-310 ◽  
Author(s):  
Amy L. Odum ◽  
Stephen C. Haworth ◽  
David W. Schaal
1967 ◽  
Vol 20 (2) ◽  
pp. 355-358 ◽  
Author(s):  
Richard F. Meginniss

Four groups of 6 pigeons, maintained at 100, 90, 80, and 70% of their ad libitum feeding weight, showed directly proportional weight-dependent depressant effects on fixed ratio key pecking following d-amphetamine treatment.


1966 ◽  
Vol 18 (1) ◽  
pp. 95-102 ◽  
Author(s):  
Peter J. Mikulka ◽  
William B. Pavlik

Rats were given 60 acquisition and 32 extinction trials in a straight runway. A 3 × 2 factorial design was employed, combining 3 levels of food deprivation with continuous and partial reinforcement schedules. The principal results were: (a) The magnitude of the partial reinforcement effect during extinction increased with increased food deprivation. (b) The major effects of deprivation during extinction were upon the performance of Ss on partial reinforcement; there was relatively little effect on the performance of continuous reinforcement Ss. (c) The frequency of competing responses differed among the experimental groups during both acquisition and extinction and generally was inversely related to running speed.


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