This primacy and recency effect varies in intensity based on list length. Position-item relationships do not account for recency and primacy effects, or the phonological similarity effect. Free recall often displays evidence of primacy and recency effects. SAM explains both primacy and recency effects. These findings provide support for the primacy effect and recency effect of serial positioning. Results from the experiment showed that all groups expressed both primacy effects and recency effects. For example, positional coding can be used to explain the effects of recency and primacy. The two main concepts in the serial position effect are recency and primacy. Frecency is any heuristic that combines the frequency and recency into a single measure. The recency of information use can influence the retrieval process of that information. Scholars disagree on provenance and recency of these practices. This is consistent with recency bias and seems contrary to the acrophobia explanation. Several terms have been used to refer to the modality effect on recency. For adolescents and young adults the reminiscence bump and the recency effect coincide. Therefore, the recency effect recedes or vanishes.