ATTACK BEHAVIOR IN A MULTIPLE FIXED-RATIO SCHEDULE OF REINFORCEMENT

Two pigeons were trained on a multiple, fixed-ratio schedule of reinforcement. When the key was red, a fixed-ratio 25 was in effect; when it was blue, a fixed-ratio 100 was in effect. Both pigeons consistently attacked a nearby stuffed pigeon only when the key color was blue even though such attack was not explicitly reinforced. © 1969, Psychonomic Journals, Inc.. All rights reserved.