It's very simple. Our past lives are reflected in the character, habits and general personality pattern. Knowing that you used to speak a certain language, were engaged in a certain type of activity, it is normal, and if you turn to a specialist, everything will fall into place.
Nothing. Because there are no past lives. And anyone who claims that he remembers something from a past life is a liar (or a dreamer, whatever).
However, we can also say that such phenomena, when a person is delirious, or sees a "divine revelation", or he "moves in space outside his body" - are associated with the work of the neural network of operational rest in the brain ... This part of the neural network is activated when the person himself is at rest and inactive. This network has not yet been fully investigated, but it is with it that the phenomenon of human consciousness is associated and it is in it that abnormal activities are found in patients with schizophrenia. So, if a person sincerely believes that he remembers a "past life", then most likely, almost certainly, he is sick.
MAXIM, you can explain something that is unprovable. For example: it's not that some people really remember their past lives, but they are quite disposed to fantasizing, dissociation and banal deja vu.