Activation Timing: thief, investigator, etc...

[pegasusteed]

that's a dilemma I'm stuck in for long.

As universal statement, I know that EVERY card must be used ONLY during your own turn EXCEPTION for one-shot items, curses, and cards where this is specified onto them.

Here's my question.

What about classes and races etc... that DO NOT exactly states their activation timing ( i.e. turn, combat or not ).

For example, take a look at the investigator class and mutant race

using his listen at the door ability, he has to do that ONLY on his own turn or also during other players' ones?

and the mutant race states that he's allowed to discard 2 door/treasures and get another new one in exchage of the same kind.


Have I to activate these effects ONLY during my turn OR may I activate them ALSO on other players' ??

the same question goes for the thief class.

please, help me out.