Monism is the opposite of dualism because it is the belief that minds and bodies are not separate things. Many monist views are called materialism because they think that minds are not anything different from matter just like bodies. In the early 20th century, a popular answer was behaviorism. Behaviorism says that a person's inner mental life is unpredictable. Only behaviors we can see are useful for scientists and philosophers. This view became unpopular in the second half of the century, during the "cognitive revolution", which saw psychology, linguistics, computer science, anthropology, neuroscience, and philosophy combine together to find ways to study the mind scientifically.
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