Concussed

Concussed (Concussion in Fallout 3 and Fallout: New Vegas) is a condition in Fallout Tactics, Fallout 3 and Fallout: New Vegas.

Fallout Tactics
Concussed is a condition caused by a blow to the head. It reduces accuracy and gives a penalty to Intelligence. It can be cured by using a doctor's bag or through time.

The concussed status is displayed in red, in the left low corner of the screen.

Fallout 3 and Fallout: New Vegas
Concussion is a status condition caused by having the head critically crippled in combat. Having it will reduce overall accuracy and give a -4 to Perception. In addition, the screen will intermittently get fuzzy and a ring will be heard through the speakers.

It is unknown if enemies really undergo a concussive state when they have their heads crippled. As with the crippling any body part, targets will momentarily pause to clutch their head.

Using a stimpak, sleeping, visiting a doctor, using My First Infirmary (if purchased for the residence), or through some other means relieving the crippled head will remove the effect and restore the Perception.