Shoemaker's immunity thesis presupposes a unified, bounded subject, but Parfitian fission cases entail that psychological states may be co-instantiated by two equally valid claimants to 'I'.

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Parfitian fission cases(as used in personal identity philosophy): Thought experiments created by philosopher Derek Parfit imagining a scenario where your brain is split and copied so that two people end up with identical memories and personalities—raising the question: which one is really 'you'?
Psychological states(in philosophy of mind and decision theory): A person's internal mental conditions—like their beliefs, desires, emotions, and motivations—which may not always show up in what they actually do.
Shoemaker's immunity thesis(as used in philosophy of mind): A theory by philosopher Sydney Shoemaker arguing that your own thoughts and feelings about your mental states are special—you have direct, privileged access to them that others don't have.
Unified, bounded subject(as used in metaphysics and philosophy of mind): The idea that there is one, single 'you' with clear boundaries—your consciousness and identity form one coherent whole that doesn't overlap with anyone else's.

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