Introspection has been used to study mental states or consciousness. In psychology, the method of introspection was criticized by behaviorists because the method of introspection was subjective and so not reliable, though introspection is used in some psychological experiments even today. What we should be careful here is the target of the criticism; whether introspection or the content of introspection is subjective. Here we are talking of only the introspection of perceptive content. The content of introspection has been thought as something like a mental image, which is inevitably subjective. According to internalism, introspection is the internal process, so the content of introspection is also internal and subjective. Dretske suggests that the content of introspection be objective. When we are aware of experience having some properties, we are aware of something objective having these properties. We aren't aware of something subjective when we introspect our perception. This idea can make the content of introspection objective, and reliable in psychological researches. However, such idea doesn't perfectly exclude subjectivity from introspection. Introspection has the subjective property in that it is always experienced by one person. But the content of introspection itself, different from the introspective event, is objective. For we are aware of facts when we introspect.

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