If degree_receiver_x_y for x=x exceeds threshold by +1,then it spikes, eg.
v[t=20]=2 ,vth=1 so spike, selector still spikes
v[t=21]=3 (still gets a +1 from selector),vth=1 keeps spiking), selector stops spiking, and is inhibited.
v[t=22]=3 (No +1 anymore because the selector was inhibited in the previous round.)
If degree_receiver_x_y for x=x exceeds threshold by +1,then it spikes, eg. v[t=20]=2 ,vth=1 so spike, selector still spikes v[t=21]=3 (still gets a +1 from selector),vth=1 keeps spiking), selector stops spiking, and is inhibited. v[t=22]=3 (No +1 anymore because the selector was inhibited in the previous round.)