According to Anil Seth, memory is crucially important in our ability to perceive and make sense of the stream of information entering our conscious processing centers.
We only experience the world as a stream of elctro/chemical bits of information and it is our memory that matches this information with prior saved information to allow us to "perceive" what we are looking at, or hearing.
Our brain has no direct access to the external world at all and only receives second hand information from which it must make sense, a "best guess".
It occurs to me that the vast areas of the brain which seem relatively dormant is actually the "warehouses" of stored memories which the brain uses to match incoming information. The HD of the brain containing trillions of stored bits and bites, which it uses to construct an internal image from incoming information and is verified visually or auditory in a cycle of "controlled hallucinations".
It is the collective memory which creates the "self" and the self's relationship to the external world as well as to its own body, which allows the self to move about and manipulate things and must be maintained for maximum efficiency.
Every time I watch Seth's lectures (he speaks fast) I seem to understand the process he describes at a little deeper level. For me this is truly a journey of discovery of the mind, the self, and my relationship to the external world.
It also allows me to get deeper insight into animal brains, which must function similar to mine, but oriented to a different, simpler reality than mine. But mammals are by no means primitive. That's reserved for lesser species such as bacteria.