FIG. 1.

Rat olfactory sensory neurons (OSNs) show spontaneous bursting activity. A: the spontaneous activity of an OSN was recorded in cell-attached configuration. ▪, the period enlarged (right) where bursts were evident. B: the spontaneous activity of an OSN was recorded in perforated patch-clamp configuration. Bursts were still present, interspaced by more various interspike intervals (ISIs) than the cell-attached recordings. ▪, the period enlarged (right) where bursts included fewer action potentials due to the hyperpolarizing current injected into the neuron (see methods). C: the probability density functions of ISIs are plotted for both cell-attached (CA) and perforated patch-clamp (PP) recordings. The table summarizes key values describing each distribution (in ms).