The Vault - Fallout Wiki

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The Vault - Fallout Wiki
Big Brained
Old World Blues
RequirementsComplete Old World Blues
Convince your brain
Re-insert brain
EffectsHead cannot be crippled
+10% DT
+10% chem addiction resistance
base idxx015bba
xx015bb1Cut contentIcon cut.png (Brain-full)
xx016049Cut contentIcon cut.png (Big Brained mirror)
Gametitle-FNV OWB.png
Gametitle-FNV OWB.png

Your brain is back in your body, but some of the advanced technologies remain: Your head still cannot be crippled, but you are only 10% more resistant to addiction now. Surprisingly your damage threshold has improved by 10% (minimum +1 DT)

Fallout: New Vegas description

Big Brained is a special perk in the Fallout: New Vegas add-on Old World Blues.


By convincing your brain to return to your body or convince it to come back to The Sink, you brain can be re-installed. Following the re-installation, your head cannot be crippled, you gain +10% Damage Threshold (with a minimum of +1) and +10% resistance to chem addictions.


  • The DT added by this perk and Brainless does not work correctly. A fix for the PC version is available here.

Behind the scenes

Icon cut content.pngThe following is based on Fallout New Vegas cut content and has not been confirmed by canon sources.
  • Apparently, the original counterpart to Brainless was to be called 'Brain-full', and the description implies that it would have provided 10% more XP, 1 more skill point per level, +1 Intelligence, and +10 Science. Additionally, there is also a mirror of Big Brained with the same name but different effects (identical addition resistance as Brainless, with +5% DR as opposed to +5% or +10% DT) and description.

Your brain is back in your body! And it's smarter now! You now gain experience at an increased rate (+10%) You gain one additional skill per level. Your Intelligence is higher (+1 INT) and your Science skill has been raised by 10.

— Brain-full description

Your brain has been augmented with advanced technologies: Your head can no longer be crippled and is resistant to chem addiction (25% resistance) and shock from bodily damage (5% Damage Resistance).

— Big Brain mirror description
Icon cut content.pngEnd of information based on Fallout New Vegas cut content.

See also