Some investigator abilities say something along the lines of '...if an investigator is on your space investifarors may...' does this bonus just apply to other investigators or can your investigator benefit from this as well.

Your investigator benefits as well ...

Page 12 Ref Guide - FAQ Section:

Q. If I use an effect that applies to “investigators,” does this include myself?

A. Yes. Unless the effect says “ other investigators ,” it affects all
investigators, including the one who is using the effect.

... unless it states "others" in the text.

Hope this helps?

Walts