I am not sure if mini strokes you
mention are Ischemia (normal blood flow is interrupted for short periods of time causing losts of very small areas of damage) or small areas of brain death (strokes that affect small areas). Either way, you
have brain damage.
Dementia happens when
the functions of the brain are changed due to
changes in the brain structure. What you
experience is nerve messages not getting where they need to go because the road is blocked or entirely gone.