Synchrony of nSICs in PPNs is rarely observed. (A) Neuronal paired recording where synchrony of nSICs is absent (n = 10 out of 12 paired recordings). The paired recording was obtained in aCSF with low Ca²⁺ and Mg²⁺ + TTX (1 µM) + strychnine (1 µM) + gabazine (10 µM). (B) Raster plot of a representative neuronal paired recording showing the decay time constant (tau) and time of occurrence of the events recorded in 300 s. A total of 49 events was recorded (events observed in neuron 1 [Δ; 30 events] or neuron 2 [•; 19 events]).