Wylie D R, Frost B J
Department of Psychology, Queen's University, Kingston, Ontario, Canada.
Exp Brain Res. 1990;82(2):327-36. doi: 10.1007/BF00231252.
The response characteristics of single-units in the nucleus of the basal optic root (nBOR) of the pigeon accessory optic system (AOS) were investigated using standard extracellular techniques. The receptive fields (RFs) were large (20-115 degrees long) and elliptical and were found throughout the contralateral visual field with the exception of the red field. The RFs did not have inhibitory surrounds and there was no evidence of retinotopic organization. Most neurons responded to small moving spots although the optimal stimulus was wholefield motion of a particular direction. Analysis of 166 single-units showed that neurons preferring upward, downward and backward (nasal to temporal) motion were equally abundant (32.5, 32.5 and 31% respectively), while less than 5% preferred forward (temporal to nasal) motion. Mapping studies demonstrated that UP units were located in the dorsal portion of the nucleus; DOWN units were found ventral to UP units; BACK units were found along the ventral surface of the nucleus; and FORWARD units were found in the posterior-dorsolateral margin of the nucleus. Most cells were excited by wholefield motion in the preferred direction and inhibited by motion approximately 180 degrees in the opposite direction, however, some cells lacked the excitatory component while other lacked the inhibitory component. Neurons were grouped into six categories based on the relative contributions of excitation and inhibition. These results are compared with investigations of the AOS of other vertebrates.
运用标准的细胞外记录技术，研究了家鸽附属视觉系统（AOS）基底视根核（nBOR）中单个神经元的反应特性。感受野（RFs）大（长20 - 115度）且呈椭圆形，除红色区域外，在对侧视野中均有发现。感受野没有抑制性周边，也没有视网膜拓扑组织的证据。尽管最佳刺激是特定方向的全场运动，但大多数神经元对小的移动光点有反应。对166个单个神经元的分析表明，偏好向上、向下和向后（鼻侧到颞侧）运动的神经元数量相当（分别为32.5%、32.5%和31%），而偏好向前（颞侧到鼻侧）运动的神经元不到5%。图谱研究表明，向上运动的神经元位于核的背侧部分；向下运动的神经元位于向上运动神经元的腹侧；向后运动的神经元沿着核的腹侧表面分布；向前运动的神经元位于核的后 - 背外侧边缘。大多数细胞在偏好方向的全场运动时被兴奋，而在相反方向约180度的运动时被抑制，然而，一些细胞缺乏兴奋成分，而另一些细胞缺乏抑制成分。根据兴奋和抑制的相对作用，神经元被分为六类。将这些结果与其他脊椎动物的附属视觉系统研究进行了比较。
