The author will undertake the attempt to outline Wittgenstein's account of subjectivity by focusing on the central notion of expression, emerging from the rejection of the false alternative between Cartesianism and Behaviourism. Although allowing us to rethink the relationships between inner and outer and self and other, the notion of expression does not seem to provide a plausible explanation of first-person authority. His main point will be that by differentiating the term knowledge (utilizing Polanyi's and Shoemaker's accounts), we can expand Wittgenstein's model in a way helps us understand self-knowledge and first person
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