Rogers L J, Andrew R J, Burne T H
Division of Neuroscience and Animal Behaviour, School of Biological Sciences, University of New England, Armidale, NSW, Australia.
Behav Brain Res. 1998 Dec;97(1-2):195-200. doi: 10.1016/s0166-4328(98)00043-6.
Chicks exposed to light during late foetal life experience stimulation of the right eye only and, in consequence, develop asymmetries of the crossed visual projections from thalamus to forebrain and differences in performance of some visual tasks when using the right or left eye. The present study compared dark- and light-incubated chicks in a test of olfaction in which clove oil odour was presented together with a coloured bead. When the chicks were tested with a blue bead and using the right nostril (left nostril occluded by wax), head shaking and pecking were elevated, compared to pretest responses to an unscented, white bead. No significant elevation of head shaking occurred in chicks tested with the blue bead and using the left nostril, although pecking increased, which indicates that these chicks attended to the visual parameters of the bead but not the odour. It appears that, when the left nostril is used, attention to an attractive visual stimulus suppresses responses to olfactory input to the left hemisphere. When the clove oil odour was presented together with a less attractive, red bead, no significant lateralisation emerged. Light or dark experience prior to hatching had no effect on the lateralised performance of the blue-bead test.
在胎儿后期暴露于光照下的小鸡仅右眼受到刺激，结果，它们丘脑到前脑的交叉视觉投射出现不对称，并且在使用右眼或左眼时一些视觉任务的表现存在差异。本研究在一项嗅觉测试中比较了黑暗孵化和光照孵化的小鸡，在该测试中，将丁香油气味与一个彩色珠子一起呈现。当用蓝色珠子对小鸡进行测试并使用右鼻孔（左鼻孔用蜡堵塞）时，与对无气味白色珠子的测试前反应相比，摇头和啄食行为增加。在用蓝色珠子测试并使用左鼻孔的小鸡中，摇头没有显著增加，尽管啄食行为增加了，这表明这些小鸡关注珠子的视觉参数而非气味。似乎，当使用左鼻孔时，对有吸引力的视觉刺激的关注会抑制对左半球嗅觉输入的反应。当丁香油气味与吸引力较小的红色珠子一起呈现时，没有出现明显的偏侧化。孵化前的光照或黑暗经历对蓝色珠子测试的偏侧化表现没有影响。
