Figure 4.

Time course of MSCTs. (a) MSCTs from a single site. The duration of five MSCTs originating at this site is indicated by the horizontal bars. Duration was measured as described in the text. Some fluctuations that are clearly above baseline noise (dashed lines) are not marked as MSCTs because their loci of origin were not at the measured site (this can also be seen by their slower rise times). (b) Distribution of MSCT duration. The total duration averaged 0.84 s. For 20 MSCTs with clear exponential decay, the total duration as measured by our method was tightly correlated with the time constant (Inset, correlation coefficient is 0.744, significant at P < 0.001).