Do Your Beliefs Really Exist, or Are They Just Useful Labels?
The Ice Cream That Exists Only in Your Head
Imagine you’re sitting at the kitchen table, thinking about a scoop of chocolate chip ice cream. You can almost taste it. But the ice cream isn’t there. So what is your thought made of? Philosophers say thoughts, beliefs, and desires all have a special property called intentionality — they are about things, even things that don’t exist or aren’t present. Your ice cream thought is about ice cream, and it can be accurate (if that’s what you really want) or mistaken (if you actually wanted a pickle).
The Representational Theory of Mind (RTM) goes back at least to Aristotle. It says that having a thought is like being in a relation to a mental representation — something inside your head that stands for the thing you’re thinking about. To believe that ice cream is cold is to have a mental representation whose content is ice cream is cold. Your desire for ice cream, your fear of melting, and your memory of a sticky cone all involve different relations to the same kind of representation. On this view, your mind is filled with inner symbols that work a bit like words or images, and thinking is the process of combining and recombining them.
This idea is powerful because it tries to explain how a physical brain can be about things at all. But it also raises a huge question: do these mental representations really exist, or are they just a convenient story we tell?
Are Your Beliefs Real?
Every day you explain why people do what they do by talking about their beliefs and desires. “She ate the sandwich because she believed it was hers and she was hungry.” This everyday mind-reading is often called folk psychology, and it works surprisingly well. But does it describe real things inside your head, or is it just a handy way to predict behavior?
Intentional realists like Jerry Fodor (1935–2017) and Fred Dretske (1932–2013) think beliefs, desires, and other propositional attitudes really exist. They argue that folk psychology is so successful and indispensable that the states it talks about must be real. Fodor even thinks that cognitive science will eventually show how these commonsense states are built out of computational relations to mental representations.
On the other side, eliminativists like Paul Churchland (b. 1942) say there’s no such thing as beliefs or desires. Churchland argues that folk psychology is a theory of the mind that has a long history of failure — it can’t explain mental illness, learning, or memory very well — and it doesn’t fit with modern neuroscience. He compares it to alchemy or the old idea that fire is caused by a substance called phlogiston. Those theories were thrown out, and he thinks belief-talk should be thrown out too.
Then there’s the in-between view of Daniel Dennett (1942–2024). He agrees that we can truly say someone believes something, but only because we adopt the intentional stance — a strategy of treating them as if they had beliefs in order to predict what they’ll do. For Dennett, there’s no deeper fact about what someone “really” believes; what matters is whether the pattern works. So, is your desire for ice cream a real inner object, or just a label that makes your behavior easier to understand? Philosophers are still arguing.
What Makes a Thought Mean What It Does?
If there are mental representations, how do they get their meaning? Why does one brain state stand for ice cream and not broccoli? Some philosophers look outside your head for the answer. Externalists say that the content of your thoughts depends on your environment. A famous thought experiment by Hilary Putnam imagines a Twin Earth where the clear liquid in lakes and faucets is not H2O but a different chemical, XYZ. If you and your twin both think “water is wet,” your thought is about H2O, but your twin’s thought is about XYZ. Even though your brains are identical, the meanings are different because the outside world is different.
Internalists, by contrast, argue that meaning must be fixed by what’s inside you — your brain states, your inner computational roles, or your conscious experience. They worry that if meanings are determined by things far away, it’s hard to see how your thoughts cause your actions. Some internalists say mental representations have narrow content (determined by you alone) plus wide content (which also depends on the world).
There’s also a big debate about whether the “what-it’s-like” feeling — the phenomenal quality of an experience — helps determine content. When you imagine ice cream, does the sensory feel of coldness and sweetness partly make the thought about ice cream, or is that a separate issue? The question of how brains latch onto things in the world is one of the deepest puzzles in philosophy of mind.
Does Redness Happen in Your Brain or Out in the World?
Try looking at a bright red apple. Where is the redness? Most people would say it’s on the apple. But consider this: your experience of red is happening in your brain. Does your brain itself turn red? That seems silly. So what is the red you see?
Representationalists like Fred Dretske and Michael Tye argue that the phenomenal character of experience — the “what it’s like” — is really just the set of properties your experience represents the world as having. The blueness you see when looking at the sky is a property the sky seems to have, not a property of your experience. Your experience is transparent: you look right through it to the world. When you have a visual experience of a tomato, your brain state represents redness out there, without itself being red. Illusions and hallucinations happen when the represented property isn’t really there, but the content is still about that property.
Phenomenalists like Ned Block and Christopher Peacocke disagree. They say that experiences have intrinsic, subjective qualities — qualia — that can’t be reduced to representations of outside things. The redness you experience is a real, internal feel, and it’s that feel that allows you to think about red things at all. For them, you couldn’t have the concept of red without having had the experience. This disagreement matters because if phenomenalists are right, then some part of your mind might not be explainable purely by physical science’s story about information and causes.
Why It Matters: The Feeling of Thinking
Most of us assume that only sensations like seeing color or feeling pain have a “what it’s like.” Thinking seems different — it’s dry, abstract, silent. But a growing number of philosophers, including David Pitt and Charles Siewert, argue that there is a cognitive phenomenology: a unique experiential quality to occurrent, conscious thought. When you suddenly understand a math problem or realize you left your keys at home, there’s something it’s like to get it — and that feeling isn’t just a mix of images or words. If they’re right, then the phenomenal realm isn’t just for the senses; it reaches into the very core of reasoning. This would challenge attempts to reduce the mind to purely computational processes and would suggest that meaning itself might have a felt dimension.
None of these debates are settled. Whether beliefs are real objects in your head, whether your brain determines meaning or the world does, whether the redness you see is in your mind or in the tomato — these questions touch everything from how you understand yourself to how artificial intelligence might one day think. The representational theory of mind gives you a vocabulary to explore them. And it all starts with a simple thought about ice cream.
Think about it
- If a brain scan showed a clear pattern every time you believed something, would that prove beliefs are real, or just that your brain can be in that pattern?
- Imagine you and a friend both think “That dog is cute.” Could your thoughts mean exactly the same thing if your experiences with dogs have been very different?
- Suppose a robot can say “I believe ice cream is delicious.” What would it take for the robot to really believe it, rather than just mimic you?
