Intellect is the measure of your mental ability. Increasing Intellect improves head shot damage with intellect governed weapons such as Robotic turrets and stun batons.

Intellect Levels

1Blockhead: You are as dumb as a box of rocks but you still do 200% head shot damage and have a 5% chance to dismember with stun batons and Robotic turrets.
2Dullard: You aren't the brightest color in the box, but you occasionally hit the nail on the head. Deal 210% head shot damage and have a 10% chance to dismember with stun batons and Robotic turrets.
3Dimwit: Even dimwits have a bright idea once in a while. Deal 220% head shot damage and have a 15% chance to dismember with stun batons and Robotic turrets.
4Thick Headed: You don't like to learn new stuff but you will if you have to. Deal 230% head shot damage and have a 20% chance to dismember with stun batons and Robotic turrets.
5Average: Being average is better than being below average. Deal 240% head shot damage and have a 25% chance to dismember with stun batons and Robotic turrets.
6Smart: You are now getting pretty smart. Deal 250% head shot damage and have a 30% chance to dismember with stun batons and Robotic turrets.
7Brilliant: Your peers consider you brilliant. Deal 260% head shot damage and have a 35% chance to dismember with stun batons and Robotic turrets.
8Intellectual: Your intellect is quite impressive. Deal 270% head shot damage and have a 40% chance to dismember with stun batons and Robotic turrets.
9Genius: You are now a true genius. Deal 285% head shot damage and have a 45% chance to dismember with stun batons and Robotic turrets.
10Mastermind: You are a mastermind of intellect. Deal 300% head shot damage and have a 50% chance to dismember with stun batons and Robotic turrets.