identity

You view your past self as a complete stranger.

A 2009 study found that brain activity patterns when thinking about your future self resemble those for thinking about a different person.

The study examined future self-continuity, not past self-reflection.

You are effectively a different person than the one you remember.

Where this comes from

Study: Ersner-Hershfield et al., 2009, Psychological Science
What the check found: The study by Ersner-Hershfield et al. (2009) in Psychological Science is accurately cited, but the claim incorrectly identifies the temporal focus of the research as the 'past self' rather than the 'future self'.
Confidence: Solid, with limits

One of these every day, and every one names the study it came from. When a finding is contested, it says so.