Abstract
The effects of five variables on short-term memory for letters were studied: Auditory Similarity, Visual Similarity, Presentation Rate, Sequence Length, and Blocks of Trials. Performance varied directly with Presentation Rate and inversely with Sequence Length and Auditory Similarity. Performance improved over blocks with high auditory and high visual similarity, and decreased under the low conditions of these variables. The improvement is attributed to learning to ignore redundant cues and attend to dues that permit discrimination. The decrement is attributed to fatigue and/or waning attention.
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