| Abstract: | Describes 2 experiments with male albino Holtzman rats (N = 64). In Exp. I, Ss were trained under partial (PR) or continuous (CR) reward in a gray or striped runway and were then trained on a simultaneous stripe-orientation discrimination. PR caused a decrement in discrimination performance after training in the striped runway but had no effect after training in the gray runway. In Exp. II, Ss received PR, CR, or no training in a runway with stripe cues on the floor of the runway varying randomly in orientation. All Ss were then trained on a simultaneous compound-cues discrimination with orientation and width of stripes relevant. After reaching criterion each S was given single-dimension tests on each dimension. PR Ss performed worse on orientation tests but not on width tests. Results are interpreted as supporting stimulus-analyzer theory. (PsycINFO Database Record (c) 2010 APA, all rights reserved) |
