<P> Recall was based on a cue which followed the offset of the stimulus and directed the subject to recall a specific line of letters from the initial display . Memory performance was compared under two conditions: whole report and partial report . </P> <P> The whole report condition required participants to recall as many elements from the original display in their proper spatial locations as possible . Participants were typically able to recall three to five characters from the twelve character display (~ 35%). This suggests that whole report is limited by a memory system with a capacity of four - to - five items . </P> <P> The partial report condition required participants to identify a subset of the characters from the visual display using cued recall . The cue was a tone which sounded at various time intervals (~ 50 ms) following the offset of the stimulus . The frequency of the tone (high, medium, or low) indicated which set of characters within the display were to be reported . Due to the fact that participants did not know which row would be cued for recall, performance in the partial report condition can be regarded as a random sample of an observer's memory for the entire display . This type of sampling revealed that immediately after stimulus offset, participants could recall most letters (9 out of 12 letters) in a given row suggesting that 75% of the entire visual display was accessible to memory . This is a dramatic increase in the hypothesized capacity of iconic memory derived from full - report trials . </P> <P> A small variation in Sperling's partial report procedure which yielded similar results was the use of a visual bar marker instead of an auditory tone as the retrieval cue . In this modification, participants were presented with a visual display of 2 rows of 8 letters for 50 ms . The probe was a visual bar placed above or below a letter's position simultaneously with array offset . Participants had an average accuracy of 65% when asked to recall the designated letter . </P>

What were the results of sperling's partial-report procedure
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