Brain research suggests that the self is the sum of the brain's subsystems.

Brain research supports the idea that the self is an integrated product of various cognitive and neural processes and systems. These subsystems include attention, emotions, perception, memory, and decision-making mechanisms, among others, that work together to give rise to a coherent and unified sense of self. This view of the self is based on the concept of neural integration, which suggests that the brain integrates and coordinates multiple cognitive and perceptual processes to generate our subjective experience of reality.