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Immediately after visual presentation, subjects were required to recall 6‐letter sequences. Sequences were drawn from four vocabularies. There were two 3‐letter vocabularies, distinguished by the probability of acoustic confusion within them, and two 9‐letter vocabularies similarly distinguished. Memory span is shown to be effectively independent of information per item, and to depend substantially on the probability of acoustic confusion within vocabularies.
Conrad et al. (Sun,) studied this question.