Full Idea
I suggest that persons are selves - that is, they are subjects of experience which have the capacity to recognised themselves as being individual subjects of experience; selves possess reflexive self-knowledge.
Gist of Idea
Persons are selves - subjects of experience, with reflexive self-knowledge
Source
E.J. Lowe (Introduction to the Philosophy of Mind [2000], Ch.10)
Book Reference
Lowe,E.J.: 'Introduction to the Philosophy of Mind' [CUP 2000], p.264
A Reaction
I would express this as 'a capacity for meta-thought'. I increasingly see that as the hallmark of homo sapiens, and the key quality I look for in assessing the intelligence of aliens. Very intelligent people are exceptionally self-aware.