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A key unanswered question about working memory is the nature of interference between items. At one extreme of existing theories, interference occurs between any two items because of a general capacity limit. At another extreme, interference depends on the similarity between particular features of different items. We examine this question in three experiments by presenting two sets of items on each trial, comprising tones or colors, with three levels of similarity between the two sets: cross-modal, unimodal with different marking features (two different musical instruments or shapes), and unimodal with the same marking feature. Another question is the extent to which the entry of presented items into working memory is obligatory or optional, which we examined by requiring retention of the first, the second, or both sets of stimuli for a recognition test shortly after the presentation of the two sets. The combination of the set similarity and attention manipulations allows us to draw conclusions about the nature of working-memory storage. The findings were not entirely in accord with any pre-existing theory. The effects of feature similarity were present in both modalities but more pronounced for sounds, whereas the detrimental effects of attention to both sets for retention occurred only for visual stimuli. Based on the findings we suggest a new, hybrid conception of working memory storage.

Attention effects in working memory that are asymmetric across sensory modalities