Molenaar J, van de Grind W A
Exp Brain Res. 1979 Sep;37(1):65-71. doi: 10.1007/BF01474254.
When a light spot moves at high angular velocity along a circular path on a screen, an annulus is preceived. This principle is used in a simple annulus generator consisting of a plane mirror that rotates about an axis making an angle alpha with the normal in the center point of the mirror. Angle alpha can be varied with a micrometer screw to change the diameter of the annular path (orbit) followed by the light spot that is projected on a screen via the rotating mirror. This results in variable diameter equal energy annuli. The diameter of the light spot can be changed to manipulate the width of the annulus. Finally, at low angular velocities an orbiting light spot is obtained. It is shown in the companion paper (Molenaar and van de Grind, 1979) that this slow orbiting of the light spot allows a precise study of the fine structure of receptive fields.
当一个光斑在屏幕上沿圆形路径以高角速度移动时，会感知到一个环。这一原理应用于一个简单的环发生器中，该发生器由一面平面镜组成，该平面镜绕着一条在镜子中心点与法线成α角的轴旋转。α角可以用微调螺丝改变，以改变通过旋转镜投射到屏幕上的光斑所遵循的环形路径（轨道）的直径。这就产生了直径可变的等能量环。光斑的直径可以改变以控制环的宽度。最后，在低角速度下会得到一个轨道光斑。在配套论文（莫伦纳尔和范德格林德，1979年）中表明，光斑的这种缓慢轨道运动允许对感受野的精细结构进行精确研究。
