# The problem of consciousness is now ripe for scientific attack by Francis Crick and Christof Koch > "The problem of consciousness is now ripe for scientific attack." > **— Francis Crick and Christof Koch**, *Toward a Neurobiological Theory of Consciousness (1990), attribution clue* Verification Status: Unverified — exact wording/source has not yet been independently confirmed against a primary source; source clue: Toward a Neurobiological Theory of Consciousness (1990), attribution clue.