Simultaneous recordings from pairs of NS neurons within a ganglion. Ai, Representative simultaneous recordings of the spontaneous activity of both NS neurons in a single ganglion. Aii, Average cross-correlogram. The cross-correlograms (bin size 0.5 msec) of six different pairs of traces were averaged. The dotted lines represent the 95% confidence interval for the mean cross-correlation index.Bi, Representative simultaneous recordings of the synaptic responses of both NS neurons, evoked by a train of action potentials (15 Hz) elicited in a P cell in a single ganglion. The scheme on top represents a ganglion and the recording configuration. NSi and NSc denote NS cells ipsilateral and contralateral to the stimulated P cell, respectively. Bii, Average of three cross-correlograms (bin size 0.1 msec). The dotted lines represent the 95% confidence interval for the mean cross-correlation index.