In 1989, retired USMC Colonel Jeff Cooper introduced a color-coding system to describe the efficiency of various states of mind during combat.
Since then, countless military and law enforcement professionals have adapted his system to teach others to better recognize danger and respond efficiently to critical situations.
Condition Yellow is defined as "a state of calm alertness and awareness," and considered the most optimal mental state.
When combined with proper training and education, Condition Yellow ensures an individual the highest chances of survival.
Completely relaxed, zero awareness. The most vulnerable state you can be stuck in. This is when you're most likely to be victimized.
A specific threat has been identified and danger is imminent. Counter-actions are being evaluated and a narrowed decision loop is now in play.
Dangerous conditions are now in place. Actions are being executed. Fine-motor skills and peripheral vision are diminished in favor of increased strength and speed.
It's life or death. All cognitive functions are completely shut down. Instinct, muscle-memory and training take over completely. The ability to form complex thoughts is lost and fine-motor skills are non-existent.