Associative symmetry in a spatial sample-response paradigm.
Symmetry has been difficult to observe in nonhumans mainly because they seem to perceive stimuli as a conjunction of visual, spatial, and temporal characteristics. When such characteristics are controlled, symmetry does emerge in nonhumans (cf. Frank and Wasserman, 2005; Urcuioli, 2008). Recently, however, Garcia and Benjumea (2006) reported symmetry in pigeons without controlling for temporal order. The present experiments explored their paradigm and the ingredients for their success. Experiments 1 and 2 sought to replicate their findings and to examine different symmetry measures. We found evidence for symmetry using non-reinforced choice probe tests, a latency-based test, and a reinforced consistent versus inconsistent manipulation. Experiment 3 adapted their procedure to successive matching to evaluate their contention that a choice between at least two comparisons is necessary for symmetry to emerge. Contrary to their prediction, symmetry was observed following go/no-go training. Our results confirm Garcia and Benjumea's findings, extend them to other test and training procedures, and once again demonstrate symmetry in the absence of language.
Department of Psychological Sciences, Purdue University, 701 Third Street, West Lafayette, IN 47907-2004, USA. marco.vasconcelos@zoo.ox.ac.uk
Marco
M
Vasconcelos
Peter J
PJ
Urcuioli
D000818:Animals; D001245:Association Learning; D002755:Choice Behavior; D003118:Color Perception; D010856:Columbidae; D004193:Discrimination Learning; D008570:Memory, Short-Term; D009949:Orientation; D010364:Pattern Recognition, Visual; D011930:Reaction Time; D012055:Reinforcement Schedule; D014163:Transfer, Psychology
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