Probiotics and brain function?

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Hello after a long break. My topic, or rather, my attempt to determine whether probiotics and gut function affect the human brain and nervous system, is motivated by my desire to help my child function better. I've read a few articles on the subject. I've read the opinions of people who give their children so-called psychobiotics, and frankly, I have mixed feelings. Does anyone know anything about this or have any experience with it?