Whether there is a soul after death, not only in Buddhism, in fact, science does not exclude. Nobel prize winner John AIKE jazz, said: people in the embryo or very young, a "self" consciousness into the brain, all functions manipulate brain, brain like computer control. It still exists after the death of the brain, and still has the form of life activity, and can be immortal.
Brain activities remain after the death of a brain? or did I misunderstood something? Because this isn't very clear to me...
when one is dead, all his parts are also dead. in fact brain can die the first so they say "you're brain dead"
when you die, every thing darkness and nothing else. those person who committed suicide knows this well because they find it the solution to end all his problem is to sleep eternally.