Reflexive pronouns (myself, yourself, himself, etc.) may be accented or not depending on their function. They are mainly used in too different ways.
Firstly, as true reflexives, that is, when the subject and the object are the same person, or also after a preposition. In this case, they are not accented.
The second use is for emphasis, in which case they are stressed. If they happen to be at the end of the IP, therefore, they take the tonic.
Of course true reflexives can be emphatic too. Then they are accented. Let’s compare these two examples:
Here are different speakers using reflexive pronouns in all the aforementioned ways:
(320) and (321) are instances of true reflexive unaccented pronouns. In the other three examples the pronouns are used emphatically. It is worth noting that in (323) the subject and the object are the same and in (324) the pronoun comes after a preposition.