No-self — anatta in Pali — is perhaps the most radical and counterintuitive teaching in Buddhist philosophy: the claim that the solid, fixed, continuous self we take ourselves to be is a construction — a useful story the mind tells rather than an independently existing entity. Meditation provides direct access to this insight by revealing that what we call 'I' is actually a rapidly changing stream of thoughts, sensations, perceptions, and intentions with no fixed center. Sam Harris, Daniel Dennett, and other secular thinkers argue that modern neuroscience and philosophy of mind converge with this Buddhist insight: there is no homunculus at the center of experience — just experience itself.

Reference:

Wikipedia: Anatta (No-Self)

https://en.wikipedia.org/wiki/Anatta