Directed Forgetting

Directed forgetting is the demonstrated reduction in a person's later ability to recall specific information after they were explicitly instructed, at the time they encountered it, to forget it, showing that memory can be voluntarily influenced by intention rather than being purely automatic. The psychologist Robert Bjork was central to developing the experimental study of the phenomenon beginning in the 1970s, and researchers established two main experimental paradigms for producing it: the item-method paradigm, in which a forget or remember cue follows each individual item as it is studied, and the list-method paradigm, in which a single forget or remember instruction is given only after an entire first list of items has already been studied and before a second list begins. The two paradigms are understood to work through different underlying mechanisms: item-method forgetting is generally attributed to a difference in how thoroughly an item gets encoded in the first place, since people simply invest less rehearsal and elaborative processing in items they are told to forget as they go, while list-method forgetting is instead attributed to a more active retrieval-inhibition process that suppresses access to the entire earlier list, which is also why list-method forgetting tends to impair free recall while leaving recognition memory comparatively less affected. The phenomenon has practical relevance to fields such as eyewitness testimony, where jurors are formally instructed to disregard certain evidence, and to clinical research on suppressing unwanted or intrusive memories.