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The superiority of repetition over mere size appears most impressively in this form, but we see again in this series that the effect decreases even with increased number of repetitions as soon as the single advertisement sinks below a certain relative size, so that the 12 times repeated twelfth-page advertisement does not possess the memory-value of the 4 times repeated fourth-page advertisement.
When we study these 300 answers which the 30 persons wrote as their first 10 reproductions, and calculate from them the chances which every one of the 60 advertisements had for being remembered, we obtain the following values: The probability of being remembered among the first 10 was for the full-page advertisement, 0.5, for the half-page 2 times repeated, 1.2, for the fourth-page 4 times repeated, 2.9, for the eighth-page 8 times repeated, 2.3, and for the twelfth-page 12 times repeated, 2.4.
If we make the same calculation, not for the totality of the advertisements but for those of a particular size, we find that the memory-value for the full-page advertisement was 0.33, for the 2 times repeated half-page advertisement, 0.30, for the 4 times repeated fourth-page advertisement, 0.49, for the 8 times repeated eighth-page advertisement, 0.44, and for the 12 times repeated twelfth-page advertisement, 0.47.
Every one of the 6 full-page advertisements which we used occurred only once, each of the 12 half-page advertisements was given 2 times, each of the fourth-page size, 4 times, each of the eighth-page size, 8 times, and each of the twelfth-page size, 12 times. The repetitions were cut from 12 copies of the magazine number.
This was the object of a series of tests which I carried on recently in the Harvard laboratory. I constructed the following material: 60 sheets of Bristol board in folio size were covered with advertisements which were cut from magazines the size of the "Saturday Evening Post" and the "Ladies' Home Journal." We used advertisements ranging from full-page to twelfth-page in size.
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