 Reflexive feedback loops continued to come up during the Macy Conferences and became a prominent issue during its later discussions as well, most notably in the discussions regarding behavioral patterns of the human mind.Warren McCulloch and Walter Pitts, also attendees, had previously worked on designing the first mathematical schema of a neuron based on the idea that each neuron had a threshold level that was to be reached, via excitation signals from incoming neurons, before firing its own signal onto others.Similarly to how Shannon had previously proven with his work in relay and switch circuits, McCulloch and Pitts proved that neural networks were capable of carrying out any boolean algebra calculations.