It seems to me that further evidence of the hidden self can be found in divination techniques. When doing a Tarot reading, the cards are chosen face down, so there cannot be any involvement of the conscious mind. The results are meaningful, however, which suggests that something inside the person knows which cards are which.
A similar principle is operating in an I Ching consultation. However, there is the added mystery of how the coins manage to land in order to give a meaningful reading.
I have discussed this at greater length in an earlier article on Divination. Please see this, if interested.