Transmigration or Reincarnation – memories and past life awarenesses fade as most of life gets in the way through our current lives. (Encouragement or discouragement of awareness can play a hinging part by those around us). Knowledge/Information can feasibly be sent telepathically by the living or deceased (via energy/frequency), however, shining talents and/or abilities of speaking and understanding other languages, composing a symphony at age of eight is clearly beyond fluke or telepathy.
Possession and manipulation by a spirit, (good or bad), is always a remote possibility, but we must ask ourselves – to what end?
Imprinting memories and personal nature as creatures do is still in the equation of all the possible explanations of the special knowledge and abilities, but the usual reincarnation testimonies are that of (actually living this 'other' life).
Consciousness Survival and the concept of time not existing outside of the paradigm of human or animal flesh brings assurance of life after death, and disparity of continued existence has to be fathomed in a whole new way. Whether depending on our earthly issues; such as guilt, anger, grievances, even non-acceptance, the non-time factor still exists and whether we choose or whether we are chosen for a different body and time is completely irrelevant to the scheme...