I cite Dr. James Le Fanu’s discussion of the “self” in this post which reference is included in my book, Nerve Endings of the Soul: Interaction Between the Mind of God and the Mind of Man through Neural Synaptic Networks.
“…the Self is an autonomous agent with freedom to choose, … founded upon a rich autobiographical inner record of memory, an accumulated subjective experience extending back to childhood, and that it possesses powers of reason and imagination expressed through language extending beyond the boundaries of personal experience. The Self is nonmaterial with no substance, and it cannot be weighed or measured. Its non-material attributes collectively form the “inner core” that is each unique individual. Self is grounded in the human brain which facilitates its formation through cognition and memory, but it has a coherent, durable transcendent reality that cannot be explained by ever-changing, transient electrical activity of neuronal circuits.”