What is consciousness? For centuries, scientists and philosophers have tried to understand how the brain creates our inner world—how neural activity translates into the taste of coffee, for example, or the sting of pain. Now, an international, theory-neutral research consortium, led by the Max Planck Institute for Empirical Aesthetics (MPIEA) in Frankfurt am Main, Germany, has put two of today’s most studied theories of consciousness to the test. The results, published in Nature, challenge core assumptions of both models and propose a new way to study complex scientific questions.