How much does illusion perks increase the level of enemy spells will work on?

Example, Fear works on people up to level 9. How about if I get the fear perk? Then the perk that increases level on humans?

You would have to get the next tier of Fear. Frenzy I think its called.

Animage adds 8 levels
Kindred Mage adds 10 levels
Hypnotic Gaze adds 8 levels
Aspect of Terrior adds 10 levels
Rage adds 12 levels
Dual Casting slightly more than doubles the level (multiply the level affected by 2.2).

Hypnotic Gaze, Aspect of Terrior and Rage are cumulative with Animage and Kindred Mage.
The bonus from being a vampire muliplies the level affected by 1.25.

thanks

Detailed info and a great table for ref...http://www.uesp.net/wiki/Skyrim_talk:Illusion/Archive_1#.22Higher_Level_Opponents.22