Septal area lesions impair spatial working memory in homing pigeons (Columba livia) |
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Authors: | Peterson Ryan M Bingman Verner P |
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Institution: | Department of Psychology and J.P. Scott Center for Neuroscience, Mind, and Behavior, Bowling Green State University, Bowling Green, OH 43403, United States |
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Abstract: | The septo-hippocampal system in birds resembles that of mammals, motivating research into the function of the avian hippocampus while surprisingly little attention has been given to the septum. To investigate a possible role of the avian septum in memory, the effects of septal area lesions on a spatial working memory (SpWM) task was tested in homing pigeons. After preoperative training on an analogue eight-arm (feeders) radial maze, now sham-operated control and septal lesioned pigeons were then trained again on the same task of locating the four feeders on the test phase of a trial that were not baited during the sample phase of a trial. During the test phase of a working memory trial, septal lesioned pigeons, compared to both their own preoperative performance and the performance of the controls, required significantly more choices to locate the four baited feeders not baited during the sample phase of a trial, and they made significantly fewer correct responses to the now baited feeders on their first four choices. The results demonstrate that, like its mammalian counterpart, the avian septum plays an important role in SpWM, suggesting that at least some functional properties of the septum are evolutionarily conserved in birds and mammals. |
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Keywords: | Abbreviations: DBB diagonal band of Broca FIRST4 first four choices HF hippocampal formation SL lateral septum SM medial septum NCL nidopallium caudolaterale PE proactive errors PFC prefrontal cortex RE retroactive errors SpWM spatial working memory TOT-TEST total choices in test phase TOT-SAMPLE total choices in sample phase WM working memory |
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