In philosophy of mind, dualism is a set of views about the relationship between mind and matter, which begins with the claim that mental phenomena are, in some respects, non-physical.
Though I often wonder where exactly the divide is. What part of our consciousness is the brain, and what part is the soul or spirit?
It seems the receptors of all data from the physical world are from the brain, but certain interpretive capabilities are non-physical. Like the ability to receive light of different wavelengths and process them as somehow different is from the brain. But the reason why w see these differences as what we call "color", and why they "look" the way they do seems like something beyond the brain. That would seem, to be the soul.
Especially making the actual move across. One second you're here, possibly seeing it coming, and then, nothing. Our minds usually repeat events that just happened as they sink in (after images, mental reverberation, etc). But now it can't even do that.
When I first heard the notion of annihilation (from the sabbatarian groups), it initially sounded even worse than the traditional Hell!