Synaptic summation is the technical term used in neurophysiology for those instances in which some neuron C is fired only by a combination of neurons A and B.
“It's nice to see the young ones 7, 8, 9 years old. It seems like they know you through their parents.”
“Repudiating the virtues of your world, criminals hopelessly agree to organize a forbidden universe. They agree to live in it. The air there is nauseating: they can breathe it.”