Fig. 9.
Selected canonical parameters characterizing afferent types. Surface projections generated from group covariance matrices represent 1 standard deviation (SD) from group means, with ellipses projected onto corresponding planes. Surfaces were constructed from all classified afferents (n = 212); SDs in the 2-dimensional planar projections ideally enclose 46% (68%2) of data points, and SDs in the 3-dimensional ellipsoids enclose 31% (68%3) of the data. Despite the separation of afferent classes emphasized by this statistical depiction, the figure shows considerable overlap, especially among group II and Ib afferents.