Three priming mechanisms revealed by time-course patterns.
(A) Definition of clustering axis Δx1 and Δx2. Δx1 refers to the maximum difference between x1 during the LD priming stage and the steady state value of x1 in the absence of any stimulus. Δx2 refers to the difference between the maximum values of x2 during the HD period with and without priming pretreatment. (B) The time courses of the priming data sets naturally divide into three clusters, corresponding to three priming mechanisms. The pie chart shows the relative frequencies of the priming mechanisms among all the priming parameter sets.