This historic book may have numerous typos and missing text.
Purchasers can usually download a free scanned copy of the original
book (without typos) from the publisher. Not indexed. Not
illustrated. 1908 edition. Excerpt: ...agrees with Table 41
although the observed values are somewhat larger than we may expect
on the basis of the numbers of this table. The results of the final
determination of the just imperceptible positive difference compare
in this way with those for the just perceptible positive
difference. A striking feature of this comparison is the sign of
the differences. The just perceptible positive difference is almost
invariably larger than the just imperceptible positive difference.
This observation agrees with the results of previous investigators
of the method of just perceptible differences, who as a rule
attributed this fact to the particular order in which the
comparison stimuli were presented. It was supposed that a small
stimulus was more readily perceived, if it was preceded by several
other small stimuli of decreasing intensity, because attention was
better adapted by the preceding stimulation. This explanation can
not hold for our experiments because the stimuli were presented in
very different order and an adaptation of attention, therefore,
cannot take place. We now turn to the description of our
observations on the just perceptible and on the just imperceptible
negative difference. The empirical determinations of the
probabilities of a "lighter"judgment are the data which we need for
this computation. These numbers are given in Table 53 (Appendix p.
198) for each subject in one double column. The numbers in the
columns marked "1" give the probabilities of "lighter"-judgments
for the various differences. The numbers in the columns marked
"not-1" give the probabilities of judgments which are not
"lighter"-judgments. These probabilities are of course equal to the
differences of the...
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