Sensitivity of the avian motion system to light and dark stimuli
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- 作者：Jean-François Nankoo ; Christopher R. Madan ; Marcia L. Spetch…
- 关键词：ON pathway ; OFF pathway ; Motion perception ; Columba livia ; Luminance
- 刊名：Experimental Brain Research
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：235
- 期：2
- 页码：401-406
- 全文大小：
- 刊物类别：Biomedical and Life Sciences
- 刊物主题：Neurosciences; Neurology;
- 出版者：Springer Berlin Heidelberg
- ISSN：1432-1106
- 卷排序：235
文摘
Global motion perception is important for mobile organisms. In laterally eyed birds, global motion appears to be processed in the entopallium, a neural structure that is part of the tectofugal pathway. Electrophysiological research has shown that motion selective cells in the entopallium are most responsive to small dark moving targets. Here, we investigated whether this bias toward dark targets of entopallial cells is mirrored by perceptual performance in a motion detection task in pigeons. We measured the detection thresholds of pigeons using random dot stimuli that consisted of either black or white dots on a gray background. We found that thresholds were significantly lower when using black dots as opposed to white dots. This heightened sensitivity is also noted in the learning rates of the pigeons. That is, we found that the pigeons learned the detection task significantly faster when the stimuli consisted of black dots. We believe that our results have important implications for the understanding of the functional role of the entopallium and the ON and OFF pathways in the avian motion system.