Abstract
Iconic memory, initially a unitary concept, was later reclassified into a multidimensional concept comprising several distinct processing events associated with the perception of brief stimuli. With respect to partial-report performance, multidimensionality was demanded by two findings : the interstimulus interval (ISI) effect (a progressive decrement in performance as the ISI is increased), and the inverse-duration effect (a progressive decrement in performance as stimulus duration is increased). Loftus, Duncan, and Gehrig (1992) suggested that both effects may be explained by a single set of principles. It is shown that given a stimulus of long duration, their model may be made to account for either the ISI effect or the inverse-duration effect, but not both
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