The automatic machine has no experience; the man at the ticket office has experience. This means that a given stimulus produces always the same reaction in the machine, but different reactions in the man. You tell an anecdote, and your hearer replies: "You should have heard how I laughed the first time I heard the story." If, however, you had constructed an automatic machine that would laugh at a joke, it could be relied upon to laugh every time, however often it had heard the joke before. You may, perhaps, find this thought comforting if you are tempted to adopt a materialistic philosophy.
Source: Bertrand Russell : Mind and Matter (1950?)
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