Corballis M C, Roldan C E
J Exp Psychol Hum Percept Perform. 1975 Aug;1(3):221-30. doi: 10.1037//0096-1523.1.3.221.
Subjects decided as quickly as possible whether dot patterns were or were not symmetrical about a line. Their decision times were shorter when the line was verticle and increased as the angle between the line and the verticle increased. This orientation function was essentially the same whether or not the subjects knew in advance what the orientation of the line would be. When the subjects tilted their heads, the function shifted in the direction of the head tilt, indicating that it was tied more closely to retinal than to gravitational coordinates. These data can be interpreted to mean that people mentally rotate patterns to a vertical orientation before judging their symmetry. This in turn suggests that the "template" for detecting symmetry may itself be embedded symmetrically in the brain.
受试者需尽快判断点阵图案是否关于某条线对称。当线为垂直时，他们的决策时间较短，且随着线与垂直线之间的角度增大，决策时间增加。无论受试者事先是否知道线的方向，这种方向函数基本相同。当受试者倾斜头部时，该函数会朝着头部倾斜的方向移动，这表明它与视网膜坐标的联系比与重力坐标的联系更为紧密。这些数据可以解释为，人们在判断图案对称性之前会在脑海中将图案旋转至垂直方向。这进而表明，用于检测对称性的“模板”本身可能对称地嵌入在大脑中。
