The document discusses editing techniques used in psychological horror movie trailers. It notes that they often use fast-paced editing to build tension and engage audiences. Specific techniques mentioned include flash cuts to show flashbacks, cross cutting between storylines, and changing the pace from slow to fast to create suspense. The document also examines how editing techniques are conventionally used differently across genres like drama, romance, and horror depending on factors like the genre's typical pacing and need to heighten senses.