Bauhaus-Universität Weimar

Psychology of Music 
ing of half-hour periods for five days and recorded the measure of 
the performance for each day. 
Figure 2 tells the story. The group consisted of nine unselected 
students of piano in the school of music. The numbers at the 
bottom indicate the days; the preliminary test is given as the 
starting point. Achievement is measured in terms of average 
deviation in the scale at the left, in which zero would mean perfect 
performance to within 0.01 of a second in metronomic time. The 
mean, showing improvement for the entire group, is indicated by 
a heavy line. 
g 1.80 
.5 1.90 
A ♦+ + + 
Fia. i.—The effect of training for precision in rhythmic action. (Henderson.**“) 
The graph shows that: (1) They started at different levels of 
achievement. In this rating there is but little agreement with their 
classification as piano students. (2) Each had his days of ups and 
downs due to a variety of conditions which modified achievement. 
The subject represented by the lowest curve had a general reputa¬ 
tion for being an erratic student; but in three extra days of training, 
she made definite progress over the fifth day’s performance. (3) 
On the whole, the group made distinctive progress during the five 
days as is illustrated by the heavy line giving the mean performance 
of the group for each day. The curves rises from 2.50 in the pre¬ 
liminary rating to 1.75 in the fifth day.


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