Lowndes M, Davies D C, Johnson M H
Department of Anatomy, St. George's Hospital Medical School, London, UK.
Eur J Neurosci. 1994 Jul 1;6(7):1143-8. doi: 10.1111/j.1460-9568.1994.tb00612.x.
The avian archistriatum has been demonstrated to play a role in agonistic behaviours and avoidance learning. However, the extent of its role in learning is unknown. The involvement of the archistriatum in the learning process of filial imprinting was therefore investigated in day-old chicks. Bilateral archistriatal lesions, lateral cerebral area lesions or sham archistriatal penetrations were made in dark-reared, day-old chicks, which were subsequently exposed to either a rotating red box or blue cylinder for 2 x 1 h training sessions. Three hours later, the approach of chicks to their training object and to the other, novel object was measured. Chicks with archistriatal lesions ran a similar distance towards each stimulus and therefore failed to display a preference for their training object. However, chicks with sham archistriatal penetrations or lateral cerebral area lesions exhibited a significant preference for the object they had been trained upon. These results demonstrate that the archistriatum is essential for the expression of an imprinted preference. All chicks approached their training object significantly more on their second compared to their first training exposure, suggesting that some aspects of imprinting behaviour remain intact in chicks with archistriatal lesions. Taken together with the results of previous work, the current data suggest that the archistriatum may be involved in retention of significant aspects of the imprinting experience, or in motivation to approach imprinting objects.
禽类古纹状体已被证明在争斗行为和回避学习中发挥作用。然而，其在学习中的作用程度尚不清楚。因此，研究人员在一日龄雏鸡中研究了古纹状体在亲子印记学习过程中的参与情况。对在黑暗环境中饲养的一日龄雏鸡进行双侧古纹状体损伤、大脑外侧区域损伤或假古纹状体穿刺，随后让它们接受旋转红色盒子或蓝色圆柱体的训练，训练分2次，每次1小时。三小时后，测量雏鸡接近其训练对象和另一个新对象的情况。有古纹状体损伤的雏鸡对每种刺激奔跑的距离相似，因此未能表现出对其训练对象的偏好。然而，接受假古纹状体穿刺或大脑外侧区域损伤的雏鸡对它们接受过训练的对象表现出明显的偏好。这些结果表明，古纹状体对于印记偏好的表达至关重要。与第一次训练暴露相比，所有雏鸡在第二次训练时明显更接近其训练对象，这表明印记行为的某些方面在有古纹状体损伤的雏鸡中仍然完好无损。结合先前工作的结果，目前的数据表明，古纹状体可能参与印记体验重要方面的保留，或参与接近印记对象的动机。
