brain /breɪn/ noun
1. an organ of soft nervous tissue contained in the skull of vertebrates, functioning as the coordinating centre of sensation and intellectual and nervous activity
Our brain is constantly working and feeding us information from each of the senses in order to make sense of the world around us. When suffering from a mental illness like C-PTSD the brain re-triggers painful thoughts or memories making it hard to differentiate between reality and fantasty.
Metacognition is the process of stepping back from the thoughts to see them for what they are - a possible perspective. The thinking and observing brain are intimately interconnected, with metacognition it is possible to consciously experience the world and then think about, and reasses the experience.
You cannot control the thoughts that appear in your mind, but you can control what you do once they appear, every action comes from a specific sequence of neural activity in the brain. Spending time observing the thoughts and sensations in our body helps to regenerate feelings of grounding, safety and our inner-self.