 Hard problem of consciousness

The "hard problem of consciousness" is a term coined by philosopher David Chalmers in the 1990s to highlight the philosophical and scientific challenge of explaining how and why we have subjective experiences, or qualia. While the "easy problems" of consciousness involve understanding the mechanisms and functions of the brain that correlate with behaviors and cognitive functions (such as perception, attention, and memory), the hard problem focuses on the nature of conscious experience itself.