I introduced
this last test because the hitting of the right holes in the
switchboard of the telephone office is of great importance. The last
individual experiment was an association test. I called six words like
"book," "house," "rain," and had them speak the first word which came
to their minds. The time was measured in fifths of a second only, as
subtler experiments, for which hundredths of a second would have to
be considered, were not needed.
In studying the results so far as the memory experiments were
concerned, we found that it would be useless to consider the figures
with more than 10 digits. We took the results only of those with 8,9,
and 10 digits. There were 54 possibilities of mistakes. The smallest
number of actual mistakes was 2, the largest, 29. In the experiment on
attention made with the crossing-out of letters, we found that the
smallest number of correctly marked letters was 107, the largest
number in the six minutes, 272; the smallest number of overlooked
letters was 2, the largest, 135; but this last case of abnormal
carelessness stood quite isolated. On the whole, the number of
overlooked letters fluctuated between 5 and 60. If both results, those
of the crossed-out and those of the overlooked letters, are brought
into relation, we find that the best results were a case of 236
letters marked, with only 2 overlooked, and one of 257 marked, with 4
overlooked.
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