Delayed Memory: Consolidation, Storage, and Retrieval
Delayed Memory on the WME tests retention after an interval, usually 20 to 30 minutes filled with unrelated activity. It targets consolidation, storage, and retrieval rather than initial encoding. Delayed free recall, cued recall, and recognition are interpreted against the immediate baseline and against normative expectations for the delay.
Core rules and concepts
- The delay must be standardized and filled. A filled interval prevents rehearsal; an unfilled interval turns the task into a rehearsal test. The examiner should not cue, rehearse, or re-expose the material before delayed recall.
- Free recall, cued recall, and recognition differ in retrieval support. Free recall is the most demanding; recognition provides the target and is easiest. A large recognition advantage over free recall points to a retrieval problem; a flat profile at chance points to a storage or consolidation problem.
- Retention is delayed performance divided by immediate performance, but the ratio is unstable when immediate scores are near ceiling or floor. Report raw scores and the ratio, and interpret with norms.
- Interference accumulates across the delay. Proactive interference from earlier lists and retroactive interference from filler tasks can lower delayed scores without a storage deficit.
- Change over time must be judged against reliable-change standards and practice effects, not just visual inspection. Age, education, and baseline ability affect expected retention.
Worked example
A candidate recalls 12/25 story elements immediately and 8/25 after 30 minutes. On delayed recognition they identify 20/25 targets with 2 false alarms. On a word list they recall 10/16 immediately and 6/16 delayed. Reasoning: story retention is 67% and list retention is 60%, both modest declines rather than catastrophic loss. Delayed recognition is much higher than delayed free recall, so retrieval-not storage-is the likely bottleneck. The two false alarms suggest source or feature confusion, not necessarily a memory failure. If recognition had been at chance, a consolidation problem would be more likely. Because the delay was filled and standardized, the comparison is valid; if the interval had been unfilled, rehearsal could have inflated the delayed score.
Traps that cost marks
- Using a nonstandard delay or allowing rehearsal during the interval.
- Cueing or re-exposing the material before delayed recall.
- Reporting percent retention without the raw immediate and delayed scores.
- Ignoring ceiling and floor effects in the retention ratio.
- Attributing all decline to storage when recognition is intact.
- Failing to apply age-corrected norms and reliable-change thresholds.