A neuroscientist achieves a complete description of every neural firing pattern in a person's brain while they see red — every synapse, every signal. According to Chalmers' hard problem, what does this description leave unexplained?
AHow the visual system processes wavelengths of light
BWhy the person's attention is drawn to red objects
CWhat it is like, subjectively, to experience the redness — the qualitative 'feel' of the experience
DHow the person would report their color perception to others
Chalmers' hard problem targets the explanatory gap between physical description and phenomenal experience. Perception, attention, and verbal report are 'easy' problems — not trivial, but tractable by cognitive science because they involve functional processes with inputs and outputs. The hard problem asks why any of this processing produces a subjective, qualitative experience at all — why there is 'something it is like' to see red rather than just information processing with no inner feel. A complete neural map still seems to leave this question open.
Question 2 Multiple Choice
What is the 'interaction problem' faced by Descartes' substance dualism?
AIt cannot explain why different people have different mental states
BIt has difficulty explaining how a non-physical mind can causally interact with a physical body
CIt commits to two substances, which violates the principle of parsimony
DIt cannot account for unconscious mental processes that have no subjective feel
Descartes held that mind (unextended, thinking) and body (extended, unthinking) are distinct substances. This seems to explain why mental and physical feel so different in kind, but creates a causal puzzle: how does a non-physical decision cause a physical arm to rise? How does a pin prick (physical event) produce pain (mental event)? If the two substances are truly distinct in kind, the causal link between them is mysterious — physical causation requires contact between extended things, but mind is unextended. This interaction problem is the classical objection to substance dualism.
Question 3 True / False
The hard problem of consciousness concerns why physical processes produce subjective experience at all — not merely how perception, attention, or memory work.
TTrue
FFalse
Answer: True
Chalmers distinguishes 'easy' problems (explaining cognitive functions like perception, attention, memory integration, verbal report) from the 'hard' problem (explaining why any of this functional processing is accompanied by subjective, qualitative experience). Easy problems are tractable because they can be addressed by showing which mechanisms produce which behaviors. The hard problem remains even after all functions are explained: why is there an inner feel rather than just information processing in the dark?
Question 4 True / False
Physicalism straightforwardly solves the mind-body problem by identifying mental states with brain states.
TTrue
FFalse
Answer: False
Physicalism identifies mental phenomena with physical phenomena, but this identification faces the explanatory gap: even granting that pain = C-fiber firing (type-identity theory), it is not obvious why this physical state feels like anything at all. Simply asserting the identity doesn't explain why consciousness accompanies brain activity rather than being absent. Physicalism is the dominant view, but it is a research program that faces serious challenges — including the hard problem — rather than a solution to them. Different physicalist strategies (functionalism, eliminativism) respond to the challenge differently, none without difficulty.
Question 5 Short Answer
What makes the 'hard problem' of consciousness hard — why can't it be solved by giving a complete neural description of what happens when someone has an experience?
Think about your answer, then reveal below.
Model answer: A complete neural description explains the functional role of brain states: which processes cause which behaviors, how attention is allocated, how signals are integrated. But it seems conceivable that all this functional processing could occur without any accompanying subjective experience — a 'zombie' that behaves exactly like us but has no inner feel. The hard problem is hard because the explanatory gap persists: even with perfect functional and neural knowledge, we seem to face an additional question of why there is 'something it is like' to undergo those processes. Functional description seems to underdetermine phenomenal experience.
The hard problem is not about complexity — it's about the kind of explanation. Cognitive science explains functions by mapping inputs to outputs via mechanisms. But subjective experience (qualia) is defined by how things seem from the inside, not by their functional role. No amount of third-person, objective description seems to automatically bridge to first-person, subjective facts. Whether this gap is real (property dualism, mysterianism) or illusory (eliminativism, strong physicalism) is the central dispute in philosophy of mind.