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This "response" happens when when we are faced with a perceived danger: your body will rev up to help you deal with the danger, and you will take action either to get away from or fend off the danger.
What is "fight or flight" OR "fight-flight-freeze".
This automatic response helps you cope with danger. For example, you may yell at your mom for pushing you to take your driving test when you don’t feel ready (fight). You may avoid going to a party or leave early because you feel uncomfortable around people you don’t know (flight). Or, you may freeze and hope the danger doesn’t notice you, like when your mind goes blank when the teacher asks you a question.