/sci/ - Science & Math

>The year is 2100 and biological immortality has been achieved
>We've achieved methods and procedures to 3D print brain tissue and successfully integrate it into a persons physiology
>Over time, you suffer from dementia, brain cancer, strokes etc.
>You replace the lost tissue with all it's former neuronal structures throughout your hundreds of years of living

Are you still the same person? How can we be sure you're experiencing the same type of conciousness you did before? Where would your ideas, memories, ambitions and personality really come from?