Sometimes we have responses that are just as quick when we experience a threat. Sometimes we call this a freeze response because our bodies may shut down or feel numb. In this state it is common to feel helpless, trapped, or depressed.
We also have a mammalian part of our brain which developed later. Polyvagal theory says the mammalian brain is responsible for things like co-regulation which means that how one mammal acts effects another.
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