Abreaction is the bringing to the surface of unpleasant suppressed thoughts and feelings in such a way that their being felt, emotionally, out in the open, lessens their power or hold over a person, and sometimes can seem to extinguish them completely. Abreaction is like a reverse lightning-rod, for it can “ground” tempestuous psychic energies that exist inside a person, in order that such energies will lose their power on the outside.

A vivid example of abreaction occurs in the dramatic conclusion of Alfred Hitchcock’s 1964 psychological thriller Marnie.