Third-person reflexives like 'himself' are anaphoric expressions that acquire their reference by depending on an antecedent noun phrase, whereas 'I' requires no antecedent and is semantically self-standing.

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Anaphoric expressions(as used in linguistics and philosophy of language): Words or phrases that get their meaning by pointing back to something mentioned earlier in a text or conversation.
Antecedent (noun phrase)(as used in linguistics and philosophy of language): The word or phrase that comes first and is referred back to by another word; for example, in 'Sarah ate her lunch,' 'Sarah' is the antecedent that 'her' refers to.
Semantically self-standing(as used in philosophy of language): Able to have meaning on its own without needing to refer back to something else mentioned earlier.
Third-person reflexives(as used in linguistics and philosophy of language): Pronouns like 'himself,' 'herself,' or 'themselves' that refer back to someone or something already mentioned in a sentence (for example, in 'John hit himself,' the word 'himself' refers back to John).

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