All over the world, and probably all though human history, a great many people have had a very realistic experience of talking with dead loved ones.
I am not here saying that the experience is what it seems. However, it is very hard to debunk. It is an absolutely true fact that this experience is very common and often has details about it that are convincing to a rational skeptical person.
If you would like to observe this phenomenon in a safe and anonymous setting, see if you can find a Spiritualist church in your community and attend a public service. Pagan movement events are also a pretty good bet. See it happen and try to figure out what it means.
And I'm sure this common worldwide experience has had a strong impact on philosophers and teachers of religion when they discuss death.