Is it implied that Dobbs was affected by the cave-in?

In the book The Treasure of the Sierra Madre, there is an indication that Dobbs has already suffered a head injury, possibly during WW1. But the movie is different, with no omniscient narrator -- places where narration occurs in the book sometimes instead have Dobbs talking, as when he points out to Curtin that while an American may beg, he can't shine shoes in Tampico.

But Dobbs really starts acting strange and intensely paranoid, right after the cave-in. He was unconscious when dragged from the tunnel and mentioned that he was knocked on the head. I think he was pretty normal, even generously paying a part of Curtin's share to finance the expedition, before the accident. Is it implied that he was affected by the cave-in?

EDIT: To be clear, it seems almost like they went out of their way to show Dobbs as a reasonable man until almost immediately after the accident but it is not 100% clear. For example, he is kind of nasty to the little kid lottery seller but he does still tip him. He says excuse me to Curtin when he first meets him.

The Dobbs we eventually see is 100% irrational-- Curtin can say nothing whatsoever to Dobbs that convinces him. He offers every possible solution, importantly does not shoot Dobbs but Dobbs imagines motives no matter how contrived for why Curtin wants to kill him and steal the gold. I forget if the book has Dobbs acting quite this crazy.

What we can say for sure is, someone who acted like Dobbs eventually acted on the trail would be completely non-functional in society. If Traven /Houston wanted to show "gold fever," why have the head injury in the book or the concussion in the tunnel? What really is the point of an organic cause for the crazy behavior?

Perhaps Traven/Houston felt that a crazy person would show gold fever in an exaggerated way, the same symptoms but accelerated by the head injury. Even if he had managed to successfully sell the gold and get back to the USA, he probably would have killed someone out of paranoia anyway.