How does Hamlet's mental state change throughout Shakespeare's Hamlet?

I would argue
that the first change we see in 's mental state occurs whenfirst sees(and the ghost leads him
away from his friends) in .  In this scene, his mental state changes rather quickly.  Hamlet's
dialogue (and his friends' responses to him) makes this clear.  He addresses his friends with an
odd response, "Hillo, ho, ho, boy!  Come and come."  The back-and-forth that follows
between Hamlet,, and Marcellus suggests that Hamlet's mind is not "right" and that his
friends are having difficulty following his line of logic.  This dialogue makes...