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Harvard Psychological Studies, Volume 1 - Containing Sixteen Experimental Investigations from the Harvard Psychological Laboratory. by Various
page 80 of 880 (09%)
problem. Each theory is right in what it affirms, but wrong in what it
implicitly or openly denies.

I next set out to determine as precisely as possible how far the
factor of fusion, or what Parrish has called irradiation, enters into
the judgments. It was evident from the beginning of this whole
investigation that fusion or displacement of the points was very
common. The term 'irradiation' is, however, too specific a term to
describe a process that works in these two opposite directions. The
primary concern of these next experiments was, therefore, to devise
means for preventing fusion among the points before the subject
pronounced his judgment. With our apparatus we were able to make a
number of experiments that show, in an interesting way, the results
that follow when the sensations are not permitted to fuse. It is only
the shorter distances that concern us here. The longer distances have
already been shown to follow the law of optical illusion, that is,
that filled space is overestimated. The object of the present
experiments is to bring the shorter distances under the same law, by
showing, first, that the objective conditions as they have existed in
our experiments thus far are not parallel to those which we find in
the optical illusion. Second, that when the objective conditions are
the same, the illusion for the shorter distances follows the law just
stated.

In repeating some of the experiments reported in Tables IV.-VIII. with
varying conditions, I first tried the plan of using metallic points at
the ends of the spaces. Thus, by an apparent difference in the
temperature between the end points and the filling, the sensations
from the end points, which play the most important part in the
judgment of the length, were to a certain extent kept from fusing with
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