# Erin Buckels Psychologist whose research on **everyday sadism** (notably the 2013 study introducing the Short Sadistic Impulse and related work on "internet trolls") helped extend the [[Dark Triad]] into the **Dark Tetrad** by adding sadism as a fourth dark trait — the gratuitous enjoyment of others' suffering. > [!note] Stub > Minimum-viable page created to resolve inbound wikilinks. Expand with the everyday-sadism and online-trolling research.