Perception is the measure of your sensory awareness. Increasing Perception raises the headshot bonus and dismemberment chance with spears, rifles, explosive weapons and tools.

Perception Levels

1Oblivious: You are pretty oblivious in the perception department. Deal 200% head shot damage and have a 5% chance to dismember with rifles, explosives, spears and tools governed by Salvage Operations.
2Unaware: You are still unaware of most things around you. Deal 210% head shot damage and have a 10% chance to dismember with rifles, explosives, spears and tools governed by Salvage Operations.
3Unobservant: You are sometimes unobservant but getting better. Deal 220% head shot damage and have a 15% chance to dismember with rifles, explosives, spears and tools governed by Salvage Operations.
4Incognizant: Your incognizant perception is usually just a small setback. Deal 230% head shot damage and have a 20% chance to dismember with rifles, explosives, spears and tools governed by Salvage Operations.
5Observant: You are observant and notice just enough to make a big difference. Deal 240% head shot damage and have a 25% chance to dismember with rifles, explosives, spears and tools governed by Salvage Operations.
6Attentive: Your attention to detail is clearly aiding you in combat. Deal 250% head shot damage and have a 30% chance to dismember with rifles, explosives, spears and tools governed by Salvage Operations.
7Discerning: You can discern weak points in enemies with ease now. Deal 260% head shot damage and have a 35% chance to dismember with rifles, explosives, spears and tools governed by Salvage Operations.
8Perceptive: Your perception is astounding. Deal 270% head shot damage and have a 40% chance to dismember with rifles, explosives, spears and tools governed by Salvage Operations.
9Astute Awareness: Your awareness is astute. Deal 285% head shot damage and have a 45% chance to dismember with rifles, explosives, spears and tools governed by Salvage Operations.
10Boom Headshot: You are unrivaled at making heads go boom. Deal 300% head shot damage and have a 50% chance to dismember with rifles, explosives, spears and tools governed by Salvage Operations.