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Coined by the physicist Max Tegmark, from perceptron +‎ -ium.


perceptronium (uncountable)

  1. A hypothetical state of matter capable of giving rise to self-awareness and subjectivity.
    • 2016 July 4, George Johnson, “Consciousness: The Mind Messing With the Mind”, in New York Times[1]:
      Max Tegmark, a physicist at the Massachusetts Institute of Physics (he also spoke at the New York event), has proposed that there is a state of matter — like solid, liquid and gas — that he calls perceptronium: atoms arranged so they can process information and give rise to subjectivity.