Suppression of ganglionic activity.
Raster plots and corresponding Peri-Stimulus-Time-Histogram of spike responses to ethanol (A) CO2 (B) or citral (C) application (insert: electrode penetration site) (4 trials; bin factor 100 ms); blue = spontaneous activity; black = stimulus evoked activity; note the rhythmic spontaneous activity found in this region. This spontaneous spiking activity is suppressed by CO2 and ethanol application. Recovery from suppression is observed after several seconds. Spontaneous activity is not influenced by citral. Recording duration = 20 s; red lines = stimulus on- and offset.