Bauhaus-Universität Weimar

Titel:
Elementary course in psychological measurements
Person:
Scripture, Edward W.
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit28736/29/
Elementary course in psychological measurements. 
117 
result gives the average time required as a minimum for the rise and exe¬ 
cution of a volition.1 
Points to be noted. 
i. Regularity and rapidity may be quite different in different persons. 
2. A very rapid person may not be a very regular one. 
Questions. 
i. How are we justified in considering the time between two muscular 
movements as a mental time? 2. What means would you suggest for 
shortening the tap-time and decreasing the probable error? 
Exercise X.—Simple reaction to sound. 
(Needed: recording drum, automatic break, smoking and varnishing arrangements, 
100 v. d. electric fork, Pfeil marker, Df.prkz marker, telephone, reaction key, adjust¬ 
able marker support, simple break switch, two batteries of 1 ampère, one battery of 2 
ampères. )2 
Apparatus. 
a. Recording drum. The drum used in this exercise is known as the 
“standard drum ” on account of the steadiness of its movement, which 
is due to the weight of the wheel.3 Glazed drum paper of the proper 
size is adjusted around the drum and is smoked on that quarter which is 
beneath the projecting arm C. The drum is moved by a ratchet handle 
at the top ; it may be stopped by the brake at the side. 
■The following table gives the results on 20 students in 1896 : 
Averages for all. 
Subject : 
A 
B 
C 
E 
F 
G 
H 
I 
I 
J 
L 
M 
X 
O 
P 
Q R 
S 
u z 
Average : 
41 
71 
59 
46 
80 
123 
7* 
92 
77 
XI3 
97 
33 
84 
72 
52 
62 147 
xx7 
xx8 60 
81 
Average 1 
variation : j 
i 12 
24 
18 
8 
9 
50 
2 
28 
*3 
36 
XX 
x4 
40 
xo 
x9 
5 20 
x7 
6 3 
x7 
Relative 
average 
33 
30 
*7 
XI 
4» 
2 
30 
17 
32 
XI 
42 
48 
7 
36 
7 12 
x5 
5 5 
21 per cent. 
variation : J 
1 
Probable 1 
error : J 
• 3-4 
6.8 
5-x 
2.2 
2.5 14.0 
0.6 7.8 
3-6 
xo.x 
3-x 
3-9 
ix.2 
2.8 
5-3 
X.4 5-6 
7.8 
1.70.8 
4-5 
The results give the times for the alternated movements naturally used by unprac¬ 
ticed persons in attempting to move the telegraph key. Ily trial the subject can finally 
select the most rapid movement, which will frequently be much quicker than the origi¬ 
nal one. The average variation (or mean variation) is the average of the residuals; in 
the example above it would be the average for the column v. 
sThe drum of the previous exercise, which is fitted with an automatic break, may be 
used for this exercise. The fork and adjustable marker support may likewise be the 
same as before. In such a case the previous exercise should be put far enough ahead of 
this one in the course to avoid any need for the same pieces in two simultaneous exer¬ 
cises. It is preferable to have several drums, all of which should have automatic contacts. 
3See Stud. Yale Psych. Lab., 1895, III, Fig. 16.
        

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