Philosophy
The Experience Machine and Internalism About Well-Being
Quick fact
In Robert Nozick's 1974 book Anarchy, State, and Utopia, he introduced the experience machine to argue against hedonism, claiming that we want to actually do things, not just have the experience of doing them.
Why this is interesting
Imagine a machine that could give you perfectly happy experiences forever. Would you plug in? Most people say no—but why?
Read the full explanation
Understanding The Experience Machine and Internalism About Well-Being
The experience machine is a hypothetical device that can simulate any experience you desire. If you plug in, you would believe you are living a rich, fulfilling life—achieving, loving, and creating—all while floating in a tank. Nozick asks: would you choose this simulated life over reality? Most people hesitate or decline. This intuition suggests that we value more than just our internal mental states—we want to genuinely connect with reality, to actually accomplish things, and to be in touch with the world. Internalism about well-being, in this context, is the view that well-being consists entirely in mental states (like pleasure or satisfaction). The experience machine challenges this view because it shows that most people value something beyond pleasant experiences.
A deeper explanation
Nozick's thought experiment is an 'intuition pump' that tests the plausibility of internalist theories of well-being, such as hedonism (pleasure is the only good) and desire-satisfaction theories (getting what you want is what matters). If well-being were purely internal, then plugging into the machine would be perfectly rational—you'd get all the pleasure and satisfaction you could want. But the strong intuition that you should not plug in reveals that we care about the external facts—the actual achievement, the real relationship, the genuine connection to reality. Nozick identifies three reasons: we want to actually do things (not just have experiences), we want to be a certain kind of person (not just an imagining of one), and we want to be in contact with a deeper reality. These reasons point toward externalism—the view that well-being also depends on objective factors outside the mind. However, the target concept here is internalism, and the experience machine can also be interpreted as supporting a nuanced internalism: perhaps the mental state must be accurate or veridical to count as well-being. Modern philosophers debate whether the intuition is decisive, but the thought experiment remains a cornerstone in discussions of well-being, forcing us to clarify what we mean by a 'good life' and whether it can be divorced from reality.