Mind Do we all see the same red? Or feel joy and sadness alike? Mapping how our inner experiences relate to one another could finally reveal how physical processes in the brain give rise to consciousness Facebook / Meta Twitter / X icon Linkedin Reddit Email Adobe Stock A few years ago, I took a zombie test. I had flown to Madison, Wisconsin, to visit neuroscientist Giulio Tononi and learn about his much-debated theory of consciousness, integrated information theory. The most tangible outcome of Tononi’s work is a consciousness detector, which has been used to check whether unresponsive patients are wide awake inside. I sat in a dentist’s-type chair as two doctors wired up my scalp for electrical readings and then brought what looked like a garden hose and nozzle up to my head. They applied harmless magnetic pulses to my cranium. A conscious brain should electrically reverberate.…