Full Idea
If, as seems intuitively plausible, I could survive with my brain detached from the rest of my body, I most certainly cannot be identical with my whole body.
Gist of Idea
If my brain could survive on its own, I cannot be identical with my whole body
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.287
A Reaction
A key mistake is to treat the notion of 'I' as all-or-nothing. My surviving brain is much more like me than my surviving kidney, but the notion of my brain saying to my family 'it's me in that jar over there' sounds wrong. It is a bit of me.