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Cognition in Stationeers is measured via Stun. Whenever you take damage in some instances or breath gasses like Nitrous Oxide your Stun percentage which is noted off by this icon in your vitals panel will increase.

As your stun increases your HUD will warn you, and as your Stun % rises you will continue to lose consciousness as your vision losses color saturation and will begin to darken until you blackout.

Status	HUD Symbol
If Stun is between 1% and 74% Your HUD will warn you that you attained Stun.
If Stun is between 75% and 99% youll get a Cognition Critical Warning.
If Stun goes over 100% you will blackout with this status being on your HUD.

Stun caps at 200% and decreases overtime given your not in a environment breathing a gas that is increasing it.

How stun works on HEM Droids

Whilst HEM Droids do not breath and thus can not be knocked out through gasses in the air. They can fall unconscious if their personal Battery is removed or if their personal Battery dies. Unlike a Human/Zrilian, Stun will not drop until a Battery with power is inserted into them. As a result the only way a HEM Droid can come to is if another player inserts one into them while they're unconscious (Or if they happen to have a wireless battery cell, are near a power transmitter, and power/charging is restored).