The inner being which you feel in union with the Mother is the psychic being.
…..the difference between the three layers of the being —
(1) The inmost psychic being which is now awakened in you.
(2) The external being which you feel doing work while the inner (psychic) is in union with the Mother.
(3) The inner mental, vital and physical consciousness which connects the two, but of which you are not as yet conscious.
Ref: The Mother with Letters on The Mother