My mother had stroke like 20 years ago. All of my siblings including myself have had moments of real trouble when we talk to her. She's very functional, but there's a sense that she is not putting herself in our shoes, which comes across as lacking empathy. Even when we try to outwardly express distress, it's like she's blind to it. I just realized recently that stroke survivors can suffer impairment to their Theory of Mind, basically rendering them blind to what others are feeling. That sense can be gone or be impaired. This was such a revelation to me and suddenly everything in the last decade made perfect sense. All this time we thought she was just really self-centered or 'slow'. It caused real frustrations and there were times we even broke down because we expect something that's just not there. We didn't know.