Output of CT neuron, O
2, for each of the I
1, I
2 input pairs in the standard gate operation calculated from stability weights and thresholds represented in Figure 12(a): Net1 is obtained applying (2). In this case Net1 is calculated as Net1 = w
1
I
1 + w
3
I
2 for each pair. Neuron 1 output, O
1, is equal to 1 when Net1 is higher than its threshold, t
1. Net2 is calculated having into account neuron 1 inhibitory output: Net2 = w
2
I
1 + w
4
I
2 − O
1. Finally the pain signal relayed to the brain from neuron 2 is triggered when Net2 > t
2.