Bauhaus-Universität Weimar

We have thus traced the processes of thought from 
the simplest forms of reaction to the most complicated 
that appear to have any regularity. The degree of 
regularity indicates the degree of control over the 
influences that affect the processes measured, and 
over the elements of which they are composed. Our 
scientific ability, however, stops at this point. It might, 
for example, be interesting to analyse and measure all 
the mental processes going on while a musician com¬ 
poses an overture, but it is just as impossible for psy¬ 
chology at present to do so as it is for physics to 
analyse the movements of a particle of air into the 
various notes of the orchestra when that overture is 
being played. 
The most promising lines for future investigations on 
the time of thought he, I believe, in the study of par¬ 
ticular cases with practical bearings. Such a concrete 
case is found in investigating the relations between 
reaction-time, thought-time, and action-time, which is 
provided for by the thought and action apparatus shown 
in Fig. 40.1 
On a horizontal rod, one metre long, there are placed 
three metal blocks, A, B, C, adjustable at any distances 
apart. The block A carries a signal, and is arranged so 
that a movement of the signal breaks an electric cir¬ 
cuit. The blocks B and C carry light bamboo rods held 
1 Scripture, Some New Apparatus, “Stud. Yale Psych. Lab.,” 
1895, iii. 106.


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