Quirks of Memory

Mood-congruent memory refers to the tendency to recall material whose emotional tone matches a person’s current mood, while state-dependent memory concerns recall linked to the internal state present during learning. The paper reviews mood and state effects, discusses an alcohol-related research analogy, and cautions that these findings do not support categorical conclusions about a witness’s reliability.

The misinformation effect occurs when information encountered after an event makes a person’s memory of that event less accurate. The overview describes a slide-study example in which a later narrative named an object incorrectly, and explains how post-event information can interfere with the original memory through suggestibility and source misattribution.

The levels-of-processing account describes memory as depending partly on how deeply people analyze information when they encounter it. The overview contrasts shallow judgments about a word’s appearance or sound with semantic judgments about its meaning, and summarizes research concerning how processing demands relate to later recall.

Sharpening is usually the way in which we remember small details in the retelling of stories we have experienced ourselves or are retelling those stories. Leveling is when we keep out parts of stories and try to tone those stories down so that some parts are excluded.

The isolation effect, also called the Von Restorff effect, describes how an item that contrasts with its surroundings is often remembered better than similar items. The paper reviews explanations based on distinctiveness and attention, the possible cost to memory for surrounding details, and weapon focus research on how a weapon can draw attention away from a perpetrator’s face.

Memory inhibition describes processes that suppress competing information so a person can retrieve a relevant memory, while some apparent forgetting may instead reflect ordinary interference. The paper reviews retrieval-induced forgetting and think/no-think studies, including debate about whether deliberate suppression is robust and whether laboratory findings can explain trauma-related repression claims.

The paper explains nine research-based recommendations for collecting eyewitness identifications and preserving the information witnesses can accurately provide. It distinguishes uncontrollable estimator variables from police-controlled system variables, then discusses safeguards such as early interviews, double-blind lineups, fair fillers, and recording a witness’s confidence at the first identification.

Imagination inflation occurs when vividly imagining an event that never happened increases a person’s confidence that it did. The paper reviews experiments showing that repetition and elaboration can strengthen this effect, and discusses how imagining or explaining possible events may influence confessions, recovered-memory work, and witness interviews.

The illusion-of-truth effect occurs when repetition makes a statement feel more believable, even without new evidence or conscious memory of hearing it before. The paper explains how familiarity and processing fluency contribute to the effect, reviews research suggesting that repetition of a correction can also reinforce a false claim, and considers implications for testimony, publicity, and courtroom instructions.

Hindsight bias is the tendency to see an outcome as more predictable after learning what happened, sometimes accompanied by a changed memory of what was known beforehand. The paper reviews how outcome knowledge can reshape judgments and recollections, and discusses why legal evaluations of conduct should attend to the information available at the time rather than rely on the outcome alone.