Volltext: The Psychological Laboratory at Harvard

4oo THE PSYCHOLOGICAL LABORATORY AT HARVARD 
fact, is always the method of debate. 
This is the great advantage of the 
modern way of studying psychology 
over the old. 
The American public is so practical 
that I feel I can alone satisfy its “ whats 
and wherefores ” by explicitly-describ- 
ing some of the investigations- being 
carried on here. 
EFFECT OF ELEMENTARY SENSATIONS 
ON ONE ANOTHER. 
Here is a lantern throwing a steady- 
light through a large tube. (See illus¬ 
tration below, the right hand group.) 
By transparent slides of colored glass 
or gelatine, the light may be made of 
any color. At the end of the tube is 
a box, like a camera. The operator 
covers his head with a cloth, and ob¬ 
serves the color of the light as it shines 
from the tube through, or on, a tiny 
hole in the dark box. The size of the 
hole can be varied by moving slides, 
worked by micrometer screws so fine 
that they measure the dimensions of the 
hole to the four-hundredth of an inch. 
The first step is to discover the 
“ threshold ” of each separate color. 
That means the smallest-sized hole 
through which each color can be dis¬ 
tinguished. This varies for different 
colors. But now comes the interesting 
point. The size of thé hole, for any 
given color seen, varies according to the 
nature of any sound heard, at the same 
time. For instance, in order to distin¬ 
guish a given red, the hole must be 
larger or smaller, in proportion as the 
pitch of a musical tone is lower or 
higher, fainter or stronger. 
STUDYING THE EFFECTS OF SOUND AND OF ATTENTION ON COLORS.
	        
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