Sheldon Cooper: You’re proposing that the self is an illusion, and that we actually have multiple centers of consciousness that are communicating with one another?

Penny Hofstadter: In laymen’s terms, yeah.

Sheldon Cooper: Huh. Interesting. So you don’t believe there’s a Cartesian self that underlies the flux of experience?

Penny Hofstadter: Maybe in my twenties, not anymore.

From The Big Bang Theory – Season 11 Episode 3: ‘The Relaxation Integration’ (11×03)