There are four kinds of memories that we cannot access at will – but a shaman can retrieve them!
1. All memories of events or feelings that occured before our brains developed our archiving system; The age varies, but for most humans very few memories, if any survive before the age of five or six. Earlier memories are sporadic and exist mostly due to repetition and discussion by family or friends. We just do not possess a reliable filing and memory organization system to retain them, so they mostly go to a huge junk file.
2. All memories that we have taught and instructed ourselves to discard as junk; Things that are unimportant to us. Every waking moment, every second we are live recorders of everything. Video, sound, sensation, all are constantly recorded. On our daily 10 minute ride or walk we see and record every tree, every leaf, every face, absolutely everything yet retain the memory of a tiny percentage: that which calls our attention on the particular moment. Our minds constantly need to discard 99.9999% of information to ensure sufficient space available in our brains for processing.
3. All memories that we have actively hidden from ourselves due to trauma. Intense fear, emotional pain, guilt, shame, disgrace cause a decision to never revisit a memory again, and these are the kind of memories that psychiatrists, psychologists and psychoanalysts look for. Slowly, through years of counselling they try to create an atmosphere of trust to allow these memories to be coaxed out and processed, hopefully healing or ameliorating the trauma.
4. All genetic memory of life since the beginning of the universe. The memory that allows us and every creature to know how to breathe, how to function. And the memories of everything before that. All genetic material on earth is finite. None of it gets destroyed, none escapes beyond the atmosphere and infinitesimal amounts get in. Genetic material is just constantly metamorphosing into new forms of life, which constantly feeds on and process itself. The big eat the small and the small eat everyone. It is an almost statistical certainly that every single human being has hosted cells from Jesus Christ and from most forms of life on our planet. The huge pool of engraved memory already present in us allows us to develop skills already mastered, such as breathing, digesting and walking.