What Is Behaviorism?

Direct Answer

Behaviorism is the thesis that mental states — beliefs, desires, pains, hopes — can be fully understood in terms of observable behavior and dispositions to behave. It emerged in the early twentieth century as a reaction against introspectionist psychology, which relied on reports of inner experience that no one else could verify. If psychology wanted to be a real science, the behaviorists argued, it needed to study something public and measurable. Behavior fit the bill.

In philosophy of mind, behaviorism took a more ambitious form. It wasn't just a methodological recommendation about how to do psychology. It was a claim about what mental terms actually mean. When you say "she believes it will rain," you're not, according to the logical behaviorist, reporting a hidden inner state. You're saying something about how she's disposed to behave: she'll take an umbrella, she'll cancel the picnic, she'll say "it looks like rain" when asked. The mental is the behavioral, full stop.

This was an attractive position for a particular reason. The mind-body problem — how mental stuff relates to physical stuff — had been eating at philosophy since Descartes. Behaviorism offered a clean solution: there's no separate mental stuff to worry about. Mental states just are patterns of behavior (or dispositions to behave). The problem dissolves because one of its terms gets redefined away.

Methodological Behaviorism: Watson and Skinner

John B. Watson is usually credited with launching behaviorism as a movement. In his 1913 manifesto "Psychology as the Behaviorist Views It," Watson argued that psychology had been held back by its focus on consciousness and introspection. These were private, unobservable, and impossible to study scientifically. The way forward was to treat psychology as a purely objective experimental discipline concerned with predicting and controlling behavior.

Watson was aggressive in his ambitions. He claimed that with enough control over the environment, he could take any healthy infant and train them to become any kind of specialist — doctor, lawyer, artist, even beggar or thief. This was less a serious research program than a provocation, but it captured the behaviorist spirit: the organism is shaped by its environment, and psychology's job is to map the shaping.

B.F. Skinner took Watson's program and refined it into what he called radical behaviorism. Skinner distinguished himself from earlier behaviorists by acknowledging that private events — thoughts, feelings — do exist. He just insisted they're behaviors too, subject to the same environmental conditioning as public actions. A thought is simply behavior that happens to be observable only by the person thinking it. This allowed Skinner to address the inner life without abandoning the behaviorist framework.

Skinner's research focused on operant conditioning — how behavior is shaped by consequences. Reinforcement increases the frequency of a behavior; punishment decreases it. Through careful experimental work, mainly with rats and pigeons, Skinner developed detailed accounts of how schedules of reinforcement produce and maintain behavioral patterns. His 1957 book Verbal Behavior attempted to extend this framework to language, treating speech as operant behavior shaped by social reinforcement.

This is where the trouble started. The same year Verbal Behavior appeared, a young linguist named Noam Chomsky published a review that would become one of the most influential critiques in the history of cognitive science. Chomsky argued that Skinner's framework, impressive as it was for simple animal behaviors, couldn't begin to account for the complexity of human language. Children produce sentences they've never heard. They understand novel structures on first encounter. They make systematic errors that reveal underlying grammatical competence, not learned associations. Language, Chomsky argued, isn't learned behavior — it's an innate cognitive capacity. The review didn't just critique Skinner's book. It challenged the entire behaviorist assumption that complex mental phenomena could be reduced to stimulus-response patterns.

Logical Behaviorism: Ryle and the Category Mistake

While Watson and Skinner were building behaviorism as a scientific program, philosophers in the analytic philosophy tradition were developing a parallel thesis. Logical behaviorism, unlike methodological behaviorism, isn't a claim about how to do science. It's a claim about meaning: mental terms are logically equivalent to behavioral dispositions.

Gilbert Ryle's The Concept of Mind (1949) is the classic statement. Ryle's target was what he called "the Cartesian myth" — the idea that minds are private inner theaters, accessible only to their owners, fundamentally different in kind from the physical bodies they inhabit. Ryle argued this picture rests on a category mistake: treating mental states as if they belonged to the same logical category as physical objects, just hidden ones. It's like a visitor being shown a university: they see the libraries, the labs, the lecture halls, and then ask, "But where is the university?" The university isn't another building alongside the others — it's the organization of all of them. Similarly, Ryle argued, the mind isn't another thing alongside behaviors — it's the pattern or disposition of behaviors.

On Ryle's view, to say someone is clever isn't to say they possess a hidden inner quality called cleverness. It's to say they're disposed to solve problems quickly, learn efficiently, give good answers, and so on. Mental predicates, on this account, don't describe inner states at all. They describe multi-track dispositions — complex patterns of readiness to behave in certain ways in certain circumstances. The behaviorist reduction isn't just a scientific convenience. It's an analysis of what mental terms actually mean.

Objections to Logical Behaviorism

Logical behaviorism faced a barrage of objections that proved devastating. The most famous comes from Hilary Putnam, who in 1963 published a paper titled "Brains and Behavior" that dismantled the position with a series of thought experiments.

Putnam's super-Spartan argument goes like this: imagine a community of people who, through rigorous training, have learned to suppress all outward signs of pain. When injured, they don't wince, cry out, or avoid the stimulus. They behave exactly as they would if they felt nothing. Yet, Putnam asks, wouldn't it be perfectly coherent to say they're in pain? If so, then pain can't be identical to pain behavior or dispositions to behave in pain-like ways. The mental state and the behavior can come apart.

The force of this argument is that it targets the logical behaviorist's central claim — that mental terms mean behavioral dispositions. If it's logically possible for someone to be in pain without any pain behavior (or disposition to such behavior), then pain and pain behavior aren't the same thing. The identity fails at the level of meaning, which is exactly where logical behaviorism needs it to hold.

Another objection concerns the circularity of dispositional analyses. Try to define "believes it will rain" in purely behavioral terms. She'll take an umbrella, cancel the picnic, say "it looks like rain." But wait — she'll do these things only if she also wants to stay dry, believes the umbrella will help, isn't trying to get wet on purpose, and so on. Every behavioral disposition you cite to define one mental state presupposes other mental states. You can't reduce the mental to the behavioral because the behavioral itself can't be specified without reference to the mental. The reduction is circular.

There's also the problem of qualitative experience — what philosophers call qualia. The felt quality of pain, the redness of red, the taste of coffee — these seem to be real features of mental life that no description of behavior can capture. A person could in principle exhibit all the behaviors associated with seeing red — sorting objects by color, saying "that's red," and so on — without actually having the experience of redness. The behavior is all there, but something is missing. Behaviorism, by design, can't account for this missing something, because it denies the missing something exists.

The Legacy of Behaviorism

By the 1970s, behaviorism was largely abandoned in both psychology and philosophy. Cognitive psychology replaced behaviorist psychology, bringing back the inner mental processes — memory, attention, reasoning, language — that behaviorism had banished. Functionalism replaced logical behaviorism in philosophy of mind, offering a way to talk about mental states as real internal states defined by their causal roles rather than their behavioral outputs.

But behaviorism's influence shouldn't be underestimated. It left several lasting marks. First, it established the principle that psychology should be empirically rigorous, testing hypotheses against observable data rather than relying on introspective reports. That principle survived even as the behaviorist framework fell. Second, it forced philosophers to be precise about the relationship between mental states and behavior. Functionalism, which became the dominant position in philosophy of mind, incorporated behaviorist insights: mental states are partly defined by their behavioral outputs, even if they aren't identical to them. Third, the techniques of behavior modification — reinforcement schedules, token economies, exposure therapy — remain useful tools in clinical psychology, even when stripped of their behaviorist metaphysics.

In a sense, behaviorism was a victim of its own ambition. It tried to solve the mind-body problem by denying that there was much of a mind to explain. That worked well enough for simple cases — stimulus, response, conditioning. But the more we learned about cognition, language, and consciousness, the harder it became to maintain that the inner life was nothing but a pattern of behaviors. The mental turned out to be richer, more structured, and more causally potent than behaviorism could accommodate. What replaced it wasn't a return to Cartesian dualism but something more nuanced: a physicalism that takes the mental seriously as a real phenomenon requiring explanation, not elimination.

Further Learning

1. Stanford Encyclopedia of Philosophy, Behaviorism.
2. Gilbert Ryle, The Concept of Mind (Hutchinson, 1949).
3. B.F. Skinner, Science and Human Behavior (Macmillan, 1953).
4. Noam Chomsky, "A Review of B.F. Skinner's Verbal Behavior," Language 35 (1959): 26-58.
5. Hilary Putnam, "Brains and Behavior," in Readings in Philosophy of Psychology, ed. Ned Block (Harvard University Press, 1980).

To explore related concepts, consider reading about the philosophy of mind, analytic philosophy, and the work of Hilary Putnam.