Comparison of discharge pattern in the tonic firing episodes of RT units in WT and Cav3.2 KO mice. In a tonic firing episode, RT unit of the WT mice (open circle) started at a shorter inter spike interval (ISI) and the interval gradually lengthened. X-axis represents normalized episode period (see text). The ISI of the WT RT units fitted well with the regression line (r = 0.91). In contrast, tonic firing of RT units of the Cav3.2 KO mice solid circles) showed less orderliness (r = 0.04). The gray lines represent linear regression fitting lines.