ancestral elements which under certain conditions may suddenly come to the fore. The individual is then precipitately thrust into an ancestral role. Now we know that ancestral roles play a very important part in primitive psychology.
Jung argues that the personality contains latent ancestral elements capable of erupting and displacing the individual ego, treating ancestral possession as a structurally grounded psychological event rather than mere superstition.
, The Archetypes and the Collective Unconscious, 1959thesis