How can a brain made of cells and electricity feel like you from the inside?
Explore different aspects of consciousness by reading these articles.
Shannon creates information theory, a toolkit that transformed computers, the internet, coding, and data science. He measures information with entropy and studies how messages survive noise in a channel.
He famously says meaning is separate from the engineering problem: the system must reliably transmit signals from many possible messages. Even in consciousness studies, Shannon’s framework shapes how people think about information in brains and machines.
Nagel says consciousness has a special inside view: there is “something it is like” to be a creature. A bat uses sonar, so its inner life is very different from ours. We can study bat behavior, but that does not automatically let us feel what being a bat feels like.
His main point is that objective science and subjective experience are not the same kind of thing. Science is amazing at outside facts, but the first-person view might need a different kind of understanding too.
Searle presents the Chinese Room argument: a system can follow symbol rules perfectly and still not understand meaning. So, he says, syntax alone is not semantics, and running a program is not the same as genuine understanding.
His target is “strong AI,” the claim that the right program literally has a mind. Searle argues minds depend on the right causal powers of brains, not only formal symbol shuffling.
Jackson gives famous thought experiments: “Fred,” who sees extra color shades, and “Mary,” a scientist who knows all the physical facts about color while living in black-and-white. When Mary finally sees color, she seems to learn something new.
That pushes a big question: if physical facts were the whole story, why is new experience still new? Jackson says conscious qualities (qualia) look like extra facts, and he explores whether they might exist without changing physical behavior.
Levine says maybe mind and brain really are connected, but we still face a deep “explanatory gap.” Even if someone says “pain is C-fiber firing,” it does not yet explain why that firing should feel like pain from the inside.
So his challenge is not just “is materialism true?” but “can we explain the link clearly?” He argues our concepts still leave a gap between brain descriptions and lived feeling.
McGinn suggests a bold possibility: humans might be too cognitively limited to solve consciousness completely. Like a cat that cannot do calculus, we may hit a natural ceiling on this question.
He does not say the answer is magic. He says the answer may exist in nature, but our mental tools may be the wrong tools to fully grasp it. This view is often called “new mysterianism.”
Wheeler asks huge questions about reality itself and argues that information may be more basic than we thought. He is famous for the phrase “it from bit,” meaning physical things might arise from yes/no informational events.
In this vision, observation and participation matter deeply in quantum physics. The paper connects consciousness-adjacent ideas to big foundations of science: what exists, and how facts become facts.
Crick and Koch try to build a practical brain-science roadmap. Instead of only arguing in philosophy, they ask which brain circuits, rhythms, and memory systems might line up with visual awareness.
They propose that attention helps “bind” features together, possibly with fast oscillations around 40–70 Hz. Their paper is a call to run concrete experiments so consciousness can be studied with evidence.
Libet studies timing in voluntary action: brain readiness signals can appear before people report the conscious wish to move. This result made many people rethink how free will and brain activity fit together.
He argues consciousness may not start every action, but it may still have a “veto” role: a brief window where we can stop an action before it happens. The paper is central in debates about choice and responsibility.
Akins answers Nagel by saying we should not give up too quickly. She argues that careful brain science can still teach us a lot about another creature’s perspective, even if that perspective is strange compared to ours.
She uses bats and vision examples to show that our imagination is limited, but evidence can stretch our understanding. Her message is: detailed biology may reveal more about “what it is like” than armchair guessing.
Lewis defends a strong materialist view: mental facts supervene on physical facts, so no mental difference can occur without some physical difference. He still takes common mental talk seriously, but wants it tied to physical reality.
He uses functional roles from folk psychology to explain how terms like belief and desire can be analyzed. The idea is reduction without deleting the mind: keep the patterns, ground them in the physical world.
Chalmers separates “easy problems” (like attention, report, and behavior control) from the “hard problem”: why any of that processing feels like something from the inside. Explaining function, he says, does not automatically explain experience.
He proposes that consciousness may require extra fundamental principles, not just standard reduction. This paper gave the phrase “hard problem” its lasting power and reshaped modern debates.
Block says people mix up two different ideas: phenomenal consciousness (what experience feels like) and access consciousness (information available for reasoning, speech, and action). Treating them as one thing causes major mistakes.
His split helps debates become clearer. A system might have rich access functions without full felt experience, or vice versa in some cases. The paper is a map for untangling “consciousness” into cleaner concepts.
Rosenthal develops a higher-order theory: a mental state is conscious when you are, in some way, aware that you are in that state. On this view, not all mental states are conscious; many can happen in the background.
He carefully separates creature consciousness, state consciousness, and introspection. That division helps build a naturalistic theory where consciousness depends on how mental states are represented, not on mystery alone.
This long follow-up responds to many critics of “Facing Up.” Chalmers clarifies misunderstandings, answers objections from materialists and others, and expands his nonreductive strategy.
He examines neuroscience, phenomenology, physics-based ideas, and psychophysical law proposals. The result is a deeper map of where major consciousness theories agree, conflict, and still need work.