This is a statistical trick that allows complicated data such as those from magnetoencephalography to be reduced to a small number of components whose co-ordinates can then be plotted on a standard graph.

• 这是一种统计学方法，能把诸如脑磁图这样的复杂数据简化为数量较少的数据，以便把相关性描绘在标准图上。