Rizzolatti G, Buchtel H A, Camarda R, Scandolara C
Exp Brain Res. 1980;38(1):37-42. doi: 10.1007/BF00237928.
Single neurons were recorded from the superficial layers of the superior colliculus of immobilized monkeys (Macaca mulatta and Macaca irus). Two main functional types of neurons were found. The neurons of the first type (Type I neurons) responded well to simple stationary and moving stimuli such as spots, bars or slits of light. The latency of their response was 41 +/- 6 ms. They were not directionally selective and responded to a large range of velocities. The neurons of the second type (Type II neurons) responded very poorly to simple visual stimuli and their activation required real objects or certain two-dimensional patterns. The mean latency of response of these units was 66 +/- 26 ms. Habituation was always present. Type II neurons were located in the lower part of the superficial layers. The characteristics of Type II neurons suggest that in the primate superior colliculus there is a mechanism that allows the recognition of the complexity and the novelty of a stimulus and guides orienting responses to those stimuli that are worth analyzing in detail.
在被固定的猴子（猕猴和食蟹猴）上丘浅层记录单个神经元。发现了两种主要的功能类型神经元。第一类神经元（I型神经元）对简单的静止和移动刺激（如光点、光条或光缝）反应良好。其反应潜伏期为41±6毫秒。它们没有方向选择性，对大范围的速度都有反应。第二类神经元（II型神经元）对简单视觉刺激反应很差，其激活需要真实物体或特定的二维图案。这些神经元的平均反应潜伏期为66±26毫秒。总是存在习惯化现象。II型神经元位于浅层下部。II型神经元的特征表明，在灵长类动物上丘中存在一种机制，该机制能够识别刺激的复杂性和新颖性，并引导对那些值得详细分析的刺激做出定向反应。
