Gazzaniga (2006) concluded that the brain often runs on autopilot, acting first and then explaining our actions later. These explanations derive from brain's own internal processes.
Gazzaniga's research primarily focused on split-brain patients, where the two hemispheres are separated. He observed that these patients often displayed unconscious behaviors controlled by one hemisphere, while the other hemisphere, responsible for conscious thought and language, generated rationalizations for these actions.
This is a suggestion that the brain itself, even without conscious awareness, is constantly processing information and making decisions. These decisions then lead to actions, and the conscious mind subsequently creates explanations to justify them.