Single-channel burst analysis. (A) Single-channel current trace showing bursts where the dotted double-headed arrow on top shows the burst length, whereas the solid double-headed arrow below shows the interburst interval. The solid bar on the right shows the closed level, and the open events are downward deflections from it. The red circle encompasses a portion of a burst and is shown in B, where the time base has been expanded by a factor of 10. The brief closing events, most of which do not reach the fully closed level in the current trace, represent the flicker gating events.